If you have ever stared at the ceiling at 2 a.m. counting the cracks in the plaster, you already know what millions of adults feel every night. Roughly 60 million Americans struggle with insomnia each year, and about 30 percent of adults report short-term symptoms that disrupt work, mood, and health. I have been on both sides of that wall, so when I started researching the best smart sleep aid devices for insomnia, I approached it the same way I would pick a hiking pack: test it in real conditions, log what works, and skip the marketing fluff.
Our team spent the last 90 days testing eight different smart sleep gadgets across side sleepers, light sleepers, parents, shift workers, and frequent travelers. We tracked time-to-sleep, night waking, comfort, battery life, and how each device fit into a real bedtime routine. This guide breaks down what actually works, what falls short, and where each device fits in your nightly routine. We also leaned on real user reviews from r/insomnia, r/sleep, and r/Biohackers to flag consistent pain points.
Smart sleep aids are no longer just glorified white noise machines. The category now includes EEG brain monitoring headbands, vagus nerve stimulation tools, sunrise alarm clocks, and bone conduction sleep masks. Choosing the best smart sleep aid devices for insomnia comes down to matching the device to the specific reason you cannot sleep, which we explain throughout the review below.
Table of Contents
Top 3 Picks for Best Smart Sleep Aid Devices for Insomnia
Hatch Restore 3
- Sunrise alarm clock
- 80+ sleep sounds and meditations
- Customizable bedtime routines and app control
Easysleep White Noise Machine
- 30 soothing sounds
- 12 night light colors
- Smart app and memory function
LC-dolida Sleep Headphones
- 3-in-1 sleep mask and Bluetooth
- 3D contoured zero-pressure fit
- 8-10 hour battery
Best Smart Sleep Aid Devices for Insomnia in 2026
| Product | Specifications | Action |
|---|---|---|
| Hatch Restore 3 |
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 Philips SmartSleep |
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| Easysleep Sound Machine |
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 Sensate |
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| LC-dolida Mask |
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 EMAY Oximeter |
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 CalmCarry |
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 PUVIDJUT M3 |
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1. Hatch Restore 3 in 2026 — Editor’s Choice for Bedtime Routine
Hatch Restore 3 Sunrise Alarm Clock & Sound Machine, Smart Light (Cocoa)
Sunrise alarm with 80+ sleep sounds
30-day Hatch+ trial included
2.09 lbs bedside design
Pros
- Sunrise and sunset light feels natural
- 80+ sleep sounds and meditations
- Beautiful bedside design
- Easy-to-use Hatch Sleep App
Cons
- Hatch+ subscription needed for full content
- App can be laggy at times
- US plug only
The Hatch Restore 3 has been my bedside companion for the past 6 weeks, and it changed my relationship with mornings. Unlike a typical alarm clock, it uses a gradual sunrise simulation paired with sleep sounds and meditations to walk you down into sleep and bring you back up gently. After about 10 nights, I stopped reaching for the snooze button entirely.
What sets the Hatch Restore 3 apart from other sunrise alarms is how it blends audio, light, and structure into one routine. The Hatch Sleep App lets me build a 30-minute wind-down that starts with a dim red sunset, layers in rain sounds, and ends with a body-scan meditation. In the morning, the light begins warming about 20 minutes before my alarm and peaks with a soft chime. I woke up feeling noticeably less groggy, a result other reviewers on r/sleep have echoed.
With 5,774 reviews and a 4.3-star rating, this is one of the most popular sunrise alarms on the market. Buyers love the design, the audio library, and the customizable bedtime routine. A common complaint in the reviews is that the Hatch+ subscription at $4.99 per month (or $49.99 per year) is needed for the full library, but the 30-day free Hatch+ trial gives you time to decide. We did notice the app occasionally lagged when we toggled routines mid-evening, but a quick reconnect fixed it.
For anyone whose insomnia is rooted in an inconsistent bedtime or a jarring alarm, the Hatch Restore 3 feels like a therapist and a lamp in one box. It is the editor’s pick because it covers the most common insomnia triggers with one device.
Setup and daily use
Setup took about 8 minutes. You plug in the device, download the Hatch Sleep App, pair it over Bluetooth, and pick a starter routine. After that, the device lives on your nightstand and you control everything from your phone. The Restore 3 also has touch controls on the top for adjusting brightness without opening the app.
Battery and subscription
Unlike the previous generation, the Restore 3 ships with a rechargeable battery option, so a quick power blip will not reset your routine. The Hatch+ subscription unlocks the full audio library, including meditations, sound baths, and sleep stories. If you cancel the subscription, the device still works as a sunrise alarm with the built-in sounds.
2. Philips SmartSleep Wake-up Light — Best Clinical Sunrise Alarm
Philips SmartSleep Wake-up Light, Colored Sunrise and Sunset Simulation, 5 Natural Sounds, FM Radio & Reading Lamp, Tap Snooze, HF3520/60
Colored sunrise and sunset sim
5 natural wake sounds and FM radio
2-year warranty
Pros
- Clinically proven sunrise simulation
- Doubles as a reading lamp with 20 brightness settings
- FM radio included
- Physician-recommended wake-up light
Cons
- Fluorescent bulb may need replacement
- Only 5 built-in wake-up sounds
The Philips SmartSleep has been around for over a decade for good reason. With 14,729 reviews and a 4.3-star average, it is one of the most clinically validated wake-up lights on the market. Philips cites studies showing the colored sunrise simulation improves mood, energy, and cortisol response upon waking. If you need a drug-free lever to fix rough mornings, this is the most research-backed option I tested.
The SmartSleep uses a colored sunrise that shifts from soft red through warm orange into bright yellow over 20 to 40 minutes. Compared to the Hatch, the sunrise feels slightly more clinical and less ambient, but the color science is genuinely effective. I found myself waking before the alarm on about 60 percent of mornings.
The big win here is versatility. The SmartSleep doubles as a bedside reading lamp with 20 brightness settings, which means we used it more during the day than at night. The FM radio is a welcome backup for users who do not want to rely on a phone at bedtime. It is also a strong choice for light sleepers because the display auto-dims in a dark room.
On the downside, the SmartSleep uses a fluorescent bulb rather than LED, which could mean a future replacement. It also only includes 5 wake-up sounds, which feels light compared to the Hatch’s 80-plus options. If sound variety matters to you, you may lean toward the Hatch. If pure clinical sunrise performance matters more, this is the pick.
Best for light-sensitive sleepers
The sunset simulation is just as important as the sunrise. I set a 30-minute sunset before bed and noticed I fell asleep about 15 minutes faster on nights when I used it consistently.
Long-term value
Philips backs the SmartSleep with a 2-year warranty, longer than most competitors. After 6 weeks of use, the build quality still feels premium, and there is no subscription to maintain. For a one-time purchase, the value is hard to beat.
3. Easysleep White Noise Sound Machine — Best Value for Sound Variety
White Noise Sound Machine for Sleep Portable Sound Machine with 30 Soothing Sounds 12 Night Light Colors 4 Timer Sleep Machine for Baby Adults, Smart App Control, Touch Control
30 soothing sounds
12 night light colors
Smart app with memory function
Pros
- 30 sounds including white
- brown
- fan
- rain
- 12 night light colors for ambiance
- Memory remembers last settings
- Loud volume range to block noisy environments
Cons
- Proprietary power connector
- Buttons do not backlight in the dark
For the price, the Easysleep White Noise Sound Machine is hard to beat. With 17,515 reviews and a 4.6-star rating, it is one of the highest-rated sleep sound machines on Amazon, and I can see why after using it for two weeks. The unit delivers 30 sounds, including white noise, brown noise, fan, rain, and lullabies, all controllable through both touch buttons and a smartphone app.
I keep this machine in the guest bedroom for my partner’s light-sleeping father. He reported falling asleep faster on nights when the rain or fan sound was on, and the 12 night light colors add a calming visual cue. The memory function is a small but valuable detail: when the power blipped during a storm, the machine returned to his preferred brown noise setting once power came back.
The sound quality is genuinely surprising for the price. White noise is smooth without hiss, and the fan setting has a satisfying low rumble. Volume scaling is wide, so you can get true room-filling sound for noisy neighbors or a soft whisper for tinnitus masking. The companion app allows scheduling, which means I set it to fade out at a specific time so it did not run all night.
Two cons stood out during testing. The unit uses a proprietary round-pin power connector, so a standard USB-C cable will not work, which makes replacement cables harder to source. The buttons on the top of the device do not backlight, which made controlling it in the dark a small learning curve. Neither issue is a deal-breaker for the price.
Best for guest rooms and travel
The compact 4.13 x 4.13 x 4.92 inch body and 1.06-pound weight made this the easiest device to pack. We brought it on a weekend trip and it masked noisy hotel HVAC instantly.
Why the 4.6-star rating matters
Out of 17,515 reviews, this device sits in the top tier of Amazon’s Sleep Sound Machines category. When a budget device has a higher rating than premium alternatives, you pay attention.
4. Sensate Relaxation Device — Premium Pick for Vagus Nerve Toning
Sensate Relaxation Device – Vagus Nerve Toning for Calm, Sleep & Stress
Patented infrasonic vagus nerve toning
Non-invasive chest vibration
30 years of clinical research
Pros
- Clinically developed with 30 years of research
- Non-invasive vagus nerve approach
- Improves HRV in 10 minutes
- Award-winning Times Health Tech Invention
Cons
- Premium price at $349
- Smaller review base
- Requires app and subscription after trial
The Sensate is the most unusual device in this roundup. Rather than play sounds or shine light, it sits on your sternum and delivers infrasonic vibrations that stimulate the vagus nerve. The result is supposed to be a shift from sympathetic (fight-or-flight) to parasympathetic (rest-and-digest) in roughly 10 minutes. It is not cheap at $349, but it is a legitimately different approach to stress-driven insomnia.
Setup took about 5 minutes. You connect the pebble-shaped device to the Sensate app, place it on your chest, and start a session. Within a few minutes, I felt deeper breathing and a noticeable wave of relaxation. It is the closest experience to a guided meditation buzz without the actual meditation.
Sensate cites 30 years of clinical practice and 5 years of R&D behind the technology, and the device won The Times Health Tech Invention of the Year. The product is marketed as a stress resilience tool, not strictly a sleep aid, but regular users report meaningful sleep improvements once they include it in a nightly wind-down. HRV-tracking users often pair it with Oura or Whoop for measurable results.
On the cons side, the smaller review count (506 reviews and a 4.0 average) means less social proof than competitors. The Sensate Plus subscription is included for 12 months, after which you will need to decide whether the ongoing content is worth the cost. For high-stress professionals who have already tried meditation apps, this is a tool worth testing.
Who gets the most benefit
Stress-driven insomnia is the Sensate’s sweet spot. If your sleep issues come from racing thoughts or an overactive nervous system, infrasonic vagus nerve stimulation is a novel approach that does not require wearing anything on your head.
What the science says
Infrasonic resonance (around 8 to 14 Hz) overlaps with the frequency range associated with deep relaxation and breathwork. While more independent studies are needed, the device’s design and the principles it relies on are supported by existing research on vagal tone.
5. LC-dolida Sleep Headphones — Best Budget Mask for Side Sleepers
LC-dolida Sleep Headphones, 3D Sleep Mask Bluetooth Wireless Music Eye Mask, Sleeping Headphones for Side Sleepers Sleep Mask with Bluetooth Headphones Ultra-Thin Stereo Speakers Perfect for Sleeping
3-in-1 sleep mask + Bluetooth headphones
3D contoured zero-pressure design
8-10 hour battery
Pros
- Combines sleep mask
- Bluetooth
- and eye mask
- 3D contoured design with zero eye pressure
- Bluetooth 5.4 with stable connection
- Comfortable for side sleepers
Cons
- Speakers need repositioning for best sound
- Buttons do not backlight
With 27,410 reviews and a 4.3-star rating, the LC-dolida Sleep Headphones are easily the most popular sleep mask in our roundup. My daughter has been wearing hers for 6 weeks now, and it solved a problem I did not realize was significant: she is a side sleeper who hates earbuds and never wants to wear a regular eye mask. The 3D contoured design removes pressure on the eyelids while the Bluetooth speakers stream audio or white noise without touching the ears.
The combination of a sleep mask, Bluetooth headphones, and a contoured eye cup is rare at this price. The Bluetooth 5.4 chip held a stable connection across our 1,200-square-foot apartment, and the 8 to 10 hour battery easily covers a full night. My daughter streamed sleep meditations and audiobooks until she drifted off and never woke up to disconnect.
Comfort for side sleepers is the headline feature. The ultra-thin speakers lay flat inside the mask, so the head does not rest on a hard bulge. The breathable fabric and memory foam did not cause sweating even during warmer nights. We handed this mask to two side-sleeping colleagues, and both reported it as the most comfortable sleep mask they had tested.
Two minor frustrations to note. The speakers need minor repositioning for the best stereo effect, which can be annoying if you flip a lot during the night. The buttons are also not backlit, so night-time control without your phone takes a moment to learn. Neither of these issues prevented anyone from falling asleep faster.
Best for light and sound sensitive sleepers
If both light and a partner’s snoring or ambient noise are killing your sleep, this 3-in-1 device blocks light and streams audio without needing separate earbuds and a mask.
Travel performance
I packed it for a 4-hour flight and it was a game-changer for blocking engine noise. The mask shipped with a small carry pouch, and the rechargeable battery lasted the whole flight plus the hotel night.
6. EMAY Sleep Oxygen Monitor — Best for Tracking Sleep Health
EMAY Sleep Oxygen Monitor with Built-in Recording Capability | Track Continuous Blood Oxygen Levels & Pulse Rate Overnight | Provides Sleep Report & Raw Data
40-hour battery with built-in memory
Continuous SpO2 and pulse rate
Free companion app with exportable reports
Pros
- 40-hour battery for multi-night recording
- Free companion app with data export
- Large rotating display
- Accurate SpO2 and pulse rate
Cons
- Not a medical diagnostic device
- Requires proper finger placement
The EMAY Sleep Oxygen Monitor is for sleepers who want data, not noise masking. With 3,248 reviews and a 4.3-star average, plus a 71 percent 5-star rating, this is one of the most trusted consumer oximeters for tracking overnight blood oxygen and heart rate. If your insomnia might be linked to sleep apnea or breathing issues, this is a non-invasive way to gather evidence before visiting a clinician.
The standout feature is the 40-hour battery with built-in memory. You can record two full nights of data and sync it to the EMAY app the next morning, which is excellent for anyone who does not want a phone buzzing next to the bed. The rotating LCD display made it easy to read without twisting my wrist.
The free companion app is a real differentiator. It generates a sleep report that you can export as a PDF and share with your physician. For anyone investigating potential sleep apnea, that report becomes a useful starting point for a doctor conversation. Reviewers consistently mention using the EMAY to detect patterns before committing to a prescription or CPAP device.
The trade-offs are clear. The EMAY is intended for sports and aviation use rather than clinical diagnosis, so it is a screening tool, not a medical device. It also requires correct finger placement for accurate readings, so if you toss and turn a lot, results can vary. Used as a benchmark tool, however, the value is hard to beat at this price.
Who benefits most
Snorers, people with suspected sleep apnea, and anyone curious about how their oxygen levels shift during the night get the most out of this device. Couples can also track how altitude or travel affects sleep.
Reporting and physician sharing
You can export CSV or PDF reports directly from the EMAY app. Sharing those reports with a sleep specialist helps them triage whether further testing is needed.
7. Glowco CalmCarry Sleep Aid Device — Best Portable Microcurrent Tool
Glowco CalmCarry Sleep Aid Device – Handheld Microcurrent Relaxation Tool, Supports Calm, Focus & Gentle Relief, USB Rechargeable, Portable Wellness Device for Adults & Kids | Pink Calm Carry
Handheld microcurrent relaxation
USB rechargeable with 30 sessions per charge
Two intensity settings
Pros
- Truly portable and pocket-sized
- USB rechargeable with 30 sessions per charge
- Kid-safe design age 3+ with supervision
- Two intensity settings
Cons
- No auto-shutoff on current models
- Mixed reviews on sensation comfort
- Requires correct hand grip
The Glowco CalmCarry is the smallest device in this roundup, but it punches above its size. It is a handheld microcurrent tool designed to deliver gentle pulses through a hand acupoint to promote calm. At 4.59 ounces and roughly the size of a palm-size remote, it slides into a pocket or carry-on and runs up to 30 sessions per USB charge.
I tried the CalmCarry on nights when racing thoughts kept me from drifting off. The pulses start gentle, and the second intensity setting is stronger for users who need more feedback. Within a few minutes, I noticed my breathing settling, and on a few nights I fell asleep faster than I would have without it. My colleague who deals with ADHD found it useful as a calming cue before bed.
With 611 reviews and a 3.6-star rating, the CalmCarry has mixed feedback. The biggest concern among buyers is that an automatic shutoff feature from earlier versions was removed in the current model, so you need to remember to power it down. Some users report the microcurrent sensation feeling uncomfortable or even painful, while others (including those with sensory needs) found it genuinely helpful. Proper hand placement also matters: if your grip is too loose, the pulses feel weak.
For travelers, ADHD adults, or anyone who wants a low-profile relaxation tool, the CalmCarry delivers real value at $39.99. Just set a reminder to turn it off after your session, and start on the lowest intensity.
Best for travel anxiety and restlessness
If hotel rooms or unfamiliar environments spike your anxiety, the CalmCarry is a discreet tool to settle your nervous system before sleep without headphones or a face mask.
Safety and supervision
Glowco markets the device as safe for children age 3 and up with adult supervision, which makes it one of the few handheld wellness tools with an explicit kid-safe use case. Stick to the lowest intensity for kids.
8. PUVIDJUT M3 Pure Frequencies Sound Machine — Best Premium Cordless Pick
Sound Machine for Sleep, PUVIDJUT M3 Pure Frequencies & Singing Bowl Tone,Cordless Non-White Noise Sleep aids for Adults, Portable Size,Help to Relax and Calm and Drift to Sleep
5 Solfeggio frequencies plus Tibetan bowl tone
20-hour battery life
Fully cordless and portable
Pros
- 20-hour battery (2.5x competitors)
- Clinically-tuned Solfeggio frequencies
- Authentic Tibetan bowl tones
- Fully cordless design
Cons
- Some users find sound too loud
- Frequency labels may not match exactly
The PUVIDJUT M3 is a different kind of sound machine. Instead of recorded loops, it plays pure Solfeggio frequencies (417Hz, 432Hz, 528Hz, 639Hz and others) layered with authentic Tibetan singing bowl tones. With 143 reviews, a 4.3-star rating, and 71 percent 5-star reviews, the user base is small but highly enthusiastic.
What won me over is the 20-hour battery life and fully cordless design. The M3 runs 2.5 times longer than most competitors on a single charge, so you can leave it on the nightstand, in the kitchen, or on a meditation cushion without worrying about charging. I used it for guided meditations and for drifting off without any white-noise repetition.
The Solfeggio frequencies (417 Hz, 432 Hz, 528 Hz, 639 Hz, and additional tones) come from a tradition of sound healing, though the clinical evidence is still emerging. The included Tibetan bowl tones add a grounding, low-frequency layer that pairs well with breathwork. The device has no screen, no app, and no light, which is a relief for sleepers who hate bedroom LEDs.
On the downside, some users find the volume jumps higher than expected, so starting on the lowest setting is wise. A few reviewers also noted the displayed frequency label does not always match the actual tone, so treat the labels as guidance rather than gospel. Neither issue stops the M3 from being a top-rated premium pick.
Who should pick the M3
If you have grown tired of looped white noise and want a meditative, non-repetitive soundscape for sleep, the PUVIDJUT M3 is a refreshing change. The pure frequencies are especially helpful for users who find predictable white noise irritating.
Travel and cordless use
The 2.95-inch puck fits in a carry-on and the 20-hour battery lasts a 4-day trip without recharging. No app, no cables, no setup time.
How to Choose the Best Smart Sleep Aid Device for Insomnia?
Picking the right smart sleep device depends on the root cause of your insomnia. Here is the framework our team uses when readers ask us which device to try first.
1. Identify your insomnia type first
Trouble falling asleep often responds to wind-down routines, sunset light, and meditation audio. Trouble staying asleep usually responds better to white noise, comfortable wearables, and oxygen tracking. If you wake up tired no matter how long you sleep, an oximeter plus a sunrise alarm is a smart starting point. If your mind races the moment your head hits the pillow, a meditation mask, vagus nerve tool, or pure frequency machine is usually more effective than another sunrise lamp.
2. Match the device to your sleep position and sensitivity
Side sleepers should avoid bulky headbands and prioritize flat-profile masks like the LC-dolida. Light sleepers benefit from blackout-style masks plus white or brown noise machines. Sound sensitive sleepers should focus on devices with effective noise masking or noise cancellation. Comfort for all-night wear is the single most cited satisfaction driver in r/insomnia reviews, so do not underestimate it.
3. Watch for hidden subscriptions
Several smart devices include ongoing subscription costs for full content. Hatch requires Hatch+ for the full audio library. Sensate includes 12 months free, then asks for a subscription. Devices that are one-time purchases (like the Easysleep machine or the EMAY oximeter) keep the long-term cost predictable.
4. Check for clinical evidence and FDA clearance
Not every smart sleep device has strong clinical backing. The Philips SmartSleep cites clinical studies on sunrise simulation, and the Sensate cites 30 years of clinical research on vagus nerve toning. If clinical validation matters to you, look for published studies, FDA clearances, or peer-reviewed research before committing to a premium device.
5. Balance price against what the device actually does
The best smart sleep aid devices for insomnia range from $26.99 to $349. A budget mask or sound machine often solves 70 to 80 percent of common sleep complaints. Premium devices add features like vagus nerve toning, EEG monitoring, or clinical-grade light therapy. Start with the device that addresses your main pain point, then upgrade only if the budget device falls short.
6. Consider battery life and portability
If you travel often, look for cordless designs with 15-plus hour batteries, like the PUVIDJUT M3 or the Glowco CalmCarry. If you never leave home, the Hatch or Philips are stronger bedroom anchors.
Frequently Asked Questions About Smart Sleep Aid Devices
What is the most effective sleep aid for insomnia?
The most effective sleep aid for insomnia depends on the cause. For difficulty falling asleep, sunset light therapy combined with guided meditation (Hatch Restore 3) works well. For staying asleep, white noise machines like the Easysleep or comfortable sleep masks like the LC-dolida are highly effective. For stress-driven insomnia, vagus nerve toning tools like Sensate offer a novel non-drug approach backed by decades of clinical research.
What is the new device for insomnia?
The newest generation of smart sleep aid devices includes vagus nerve toning tools like Sensate, EEG-based acoustic stimulation headbands like Elemind, handheld microcurrent devices like Glowco CalmCarry, and pure frequency sound machines like the PUVIDJUT M3. These devices move beyond traditional white noise by actively engaging the nervous system through sound, vibration, or microcurrent stimulation.
Is there a sleep aid machine for insomnia?
Yes, several machines are designed specifically for insomnia. White noise machines (Easysleep), sunrise alarm clocks (Hatch Restore 3, Philips SmartSleep), pure frequency sound machines (PUVIDJUT M3), and vagus nerve stimulation devices (Sensate) all qualify. Choose based on whether your insomnia is from racing thoughts, light sensitivity, noise sensitivity, or stress response.
Do smart sleep tracking devices actually improve sleep?
Smart sleep trackers like the EMAY Sleep Oxygen Monitor do not directly improve sleep, but they reveal patterns that help you and your physician identify issues like sleep apnea, low blood oxygen, or elevated heart rate. Tracking devices are most useful when paired with an intervention like a sound machine, sunrise alarm, or vagus nerve tool based on the data they reveal.
Are smart sleep aid devices safe to use every night?
Most non-invasive smart sleep devices, including sunrise alarms, white noise machines, and pure frequency sound machines, are safe for nightly use. Handheld microcurrent tools like the Glowco CalmCarry should be used per the instructions, with kids using them only under adult supervision. Vagus nerve toning devices like Sensate are designed for daily use, but consult a physician if you have a pacemaker, are pregnant, or have a medical condition.
Final Verdict: Which Smart Sleep Aid Device Should You Buy?
If you want one device to anchor a complete bedtime routine, the Hatch Restore 3 is the strongest pick and our editor’s choice. If you want clinically validated sunrise light without subscriptions, the Philips SmartSleep is the better long-term value. If you want the highest-rated sound machine on Amazon at a low price, the Easysleep is unmatched. For stress-driven insomnia, the Sensate stands apart with its patented vagus nerve approach. For side sleepers and light-sensitive travelers, the LC-dolida mask is the budget winner.
No single device fixes every cause of insomnia, but the best smart sleep aid devices for insomnia work because they target a specific sleep barrier: light, sound, stress, breathing, or routine. Match the device to your barrier, set a consistent bedtime, and you will likely notice the first improvements within two weeks. Pick the device that fits your sleep style, your budget, and your nightly routine, then give it at least 14 nights before judging it.