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Over 2,000,000 Downloads Worldwide!

Enjoy a refreshing sleep and a comfortable awakening!
This application will gently awaken you at the right time.


■Wake up refreshed every morning!■

■Analyze your REM and non-REM sleep using the iPhone's accelerometer!
■REM sleep is generally classified as the period of light sleep, while non-REM sleep is the period of heavy sleep.
■Good Night's Sleep Alarm ensures that you are in a light sleep cycle before sounding the alarm, allowing for a natural and comfortable awakening.

■A total of 20 tracks! Soothing Music and Stress-Free Alarm Tones■
When going to bed, you can pick from 10 original tracks to help you enjoy a restful sleep. This music has a calming effect and helps induce a pleasant night's rest. You can also choose from 10 original alarm tones. We have provided relaxing, stress-free tones that will make waking up a pleasure. (High energy alarms are also included, should you need them!)

■Use graphs to check your sleep progress!■
Each day, you can check how light or deep your sleep was and how many hours of sleep you got. You can then share your sleep graph through Twitter, Facebook or e-mail.


◆Compatible OS
iOS 6.0 or higher

[Usage Precautions]

・Do not push the home or lock button and terminate the application when using the alarm.

・Always connect your charger to your phone when using the alarm.

・If the app does not accurately measure your sleep data, try adjusting the position of your phone.

※If you have any questions, please feel free to contact us at info+ios+zero+kaimin@support.a-tm.co.jp.
※Please be aware that we cannot reply to reviews written in the review section.


All of us on the ZeroApp team thank you for using our app!!

What’s New

Version 1.2.15

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Ratings and Reviews

5.0 out of 5
1 Rating

1 Rating

I don't like this "nickname" ,

Amazing app

I’ve used this app since high school, it’s the only one I’ve ever had actually work. Now it doesn’t work with my version of IOS 13 and I need it fixed 😩

Bunbunthor ,

A fun app!

I enjoy this app. The graph is fun to look at and the alarm itself works. Sometimes it wakes you up fifteen minutes early or so-- yet you still feel ready to wake up. It really does know how to wake you up at the optimal time.

There is snooze. The screen dims black when phone is flipped over. No complaints :)

jjetttt ,

Views 1 day, History Blocked

I used to be able to see my sleep history, but now it's blocked by an add that says you need to purchase an upgrade. I'd happily do so, but it doesn't allow you to. It's stuck in a loop, thinking, and never advances. Ever. At all. So history is inaccessible.

Being that if you grab your phone to see what time it is, and the app shuts down automatically because it thinks you're awake now, you have to set it again, when you go back to sleep. No big deal, but now you'll only see that last portion. You can't any prior part of the night, because history is blocked and can not be released.

Get your add out of there! Or let us purchase the upgrade! This is BS. The app is worthless without it.

App Privacy

The developer, Ateam Inc., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Used to Track You

The following data may be used to track you across apps and websites owned by other companies:

  • Identifiers
  • Usage Data

Data Linked to You

The following data may be collected and linked to your identity:

  • Identifiers

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Purchases
  • Location
  • User Content
  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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