NightWell:Smart Sleep Tracker

Contains adsIn-app purchases
4.2
28K reviews
Content rating
Everyone
1M+
Downloads
Enjoy this app for free, plus many more free of ads and in-app purchases, with a Google Play Pass subscription. Learn more
Content rating
Everyone
Learn more
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About this app

Discover deeper, more restful nights with NightWell, your smart sleep companion.
Track sleep patterns, monitor snoring, and wake up gently with intelligent alarms designed around your natural rhythm.
Gain personalized insights to improve your rest, energy, and focus every day.
Calm sounds and mindful tips help you relax before bed and rise refreshed in the morning.

====Features====
NightWell is a multi-functional alarm clock designed to support and improve your sleep. For people who have trouble falling asleep or waking up refreshed, it has a lot of amazing functions to improve their sleep habits.

◆Lull Sounds
The healing lull sound will be played to induce peaceful sleep. This is very good for people who suffer from insomnia, who have trouble falling asleep or who need to relax more in sleeping.

◆Smart Alarm
This is available for those who always wake up feeling tired, who turn off the alarm only to fall back to sleep or who have trouble waking up in the morning due to hypotension. This monitors body movements using accelerometer in your smartphone and activates the alarm when you're in light sleep.

◆Sleep Report
If you use this app every day, you can get your own report analyzing your sleep in various aspects. This report detects your sleep cycle and provide you with the tips to sleep better.

◆Cloud Service
This is the service to keep all of your Sleep Log on the dedicated server safely.
When you change your device, you can transfer the data from your old device to the new one. This is a free service.

◆Others
・Wake-up task provides strong support for your awakening.
・Fade-In in the alarm sound wakes you up gently.

===="Premium" Subscriptions ====
●By purchasing the subscription, all Premium features are available for free and all in-app ads are hidden.
●The subscription fee will be charged to your Google ID.
●Offer the free trial per Google ID.
●The subscription fee will be charged within 24 hours before the end of the free trial. To cancel it during the free trial period, please proceed with the procedure more than 24 hours before the trial ends.
●The subscription fee will be charged within 24 hours before the expiration date. You can cancel the updates more than 24 hours before the expiration date.
●The subscription fee is non-refundable even if there is a time period of use when canceling your subscription.
●For cancellation of the updates, you can do it on MENU on Google Play.

====Terms of Service & Privacy Policy====
Terms of Service : https://jukusui.com/en/terms
Privacy Policy : https://jukusui.com/en/privacy
====Support====
jukusui@c2inc.co.jp
Updated on
May 7, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Location, Personal info and 4 others
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

4.2
26.7K reviews
Takayuki Hanada
April 27, 2026
This app may be providing my phone number to a third party. After switching the app's language to Japanese and restarting the app, the terms of service screen and agreement button reappeared. About 15 minutes after pressing the button, I received a call from a hospital that is not in my area. Of course, I have never been there. It is possible that my information is being shared with third parties through advertisements. the android veraion is 16.
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Nikos Papadopoulos
August 27, 2022
Very comprehensive sleep recording app! Plenty of statistics and features set. I really like it! Some minor asks would be: * Add a note field to each sleep entry to store some sleep-relevant info like: "had some drinks", "ill with the flu", "took anti-snore medicine x" * Add an option to stop the site-related notifications which are in Japanese. * Add a page for feedback and suggestions😀
19 people found this review helpful
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C2 INC
September 9, 2022
熟睡アラームサポート担当です。いつも熟睡アラームをご利用いただき誠にありがとうございます。また貴重なご意見誠にありがとうございます。いただきましたご意見は今後のアプリ改善の参考にさせていただきます。熟睡アラームは皆様が質の高い睡眠を実現できるよう、またより便利で使いやすくなるよう改善を続けてまいります。引き続き熟睡アラームをご愛顧くださいますようお願い申し上げます。
Vincent Maldia
August 31, 2020
Best alarm app. It wakes you up when your sleep cycle is favorable. You can make weekly schedules. Just set it once and forget it. Annoying ads though.
29 people found this review helpful
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C2 INC
September 1, 2020
熟睡アラームサポート担当です。いつも熟睡アラームをご利用いただき誠にありがとうございます。熟睡アラームは継続してご利用いただくことでユーザ一人一人にあった睡眠リズムを発見することができます。就床時刻、起床時刻、睡眠時間、睡眠前の習慣(お風呂、運動、ストレッチ等)が安定ですることでさわやかな目覚めと日中の活力充実が実現できます。引き続き熟睡アラームをご愛顧くださいますようお願い申し上げます。

What’s new

Minor fix.