Sleep Cycle Calculator helps you figure out when to go to sleep, and when to wake up, in order to feel rested, energized and refreshed and avoid the morning groggy feeling.


This is a free sleep app that can set an alarm for you to wake up in-between sleep cycles in order to start the day relaxed and with a clear mind.

Every time you go to sleep, you experience a series of sleep cycles that last on average 90 minutes, and waking up during one of the sleep cycles makes you feel groggy and exhausted even with plenty of hours of sleep - sleep cycle calculator tries to determine the best wake up times, or go to bed time in order to workaround this situation.

Perfect at figuring out sleep cycles and recommended for people who have trouble sleeping and don't have a fixed sleeping schedule.

There are four sleep calculation scenarios to choose from:
Scenario 1: you want to know when to go to sleep in order to wake up at a specified time. Sets a go to bed alarm.
Scenario 2: you want to know when to wake up if you go to bed at a specific time. Sets a wake up alarm.
Scenario 3: you want to know the best times to wake up if you go to sleep right now.
Scenario 4: you plan to take a power nap and you want to know when you should wake up.

What this app does
• This Sleep Calculator app is the Android companion of the website https://sleep-calculator.com/
• Calculates when you should wake up and when you should go to sleep in order to wake up in-between sleep cycles.
• Calculates when you should wake up if you were to go to sleep now or take a power-nap.
• Calculates a list of possible "go to bed" or "wake up" times depending on your needs.
• The app is able to add alarms to the default Android Alarm app by selecting a time entry available in the sleep cycles list.
• Sleep Calculator provides a settings option to take into the time it takes for you to fall asleep (default: 14 minutes).
• Sleep Calculator provides a settings option to take into the length of a sleep cycle (default: 90 minutes).
• The clock hour format used by sleep calculator is the devices current system setting (24 hours format or the AM/PM format).
• Option to choose from 7 different themes / skins.
• Option to choose from the available application translations in case you don't want to app in your native locale or have a language preference..

What this app does not
It's not an alarm clock app replacement, it only allows you to add an alarm to your Android stock alarm clock app.

Translators:help translate Sleep Calculator in your language so others can enjoy it too! the translation project here: https://sleepcalculator.oneskyapp.com/collaboration

Keep in touch
Facebook: https://www.facebook.com/sleepcyclecalculatorapp/
voice: http://sleepcalculator.voice.com/

Android version : 4.1+

Intelligent Caller ID functionality added. Caller ID now helps you identify callers - even the ones not in your list. This feature is optional and you can adjust or disable Caller ID at any time in the settings menu.

// Option A // 5e7015

To Sleep Calculator mod from happymod.completedownload.net.
You need enable the option "Unknown Sources".
1. Click on the above link to Sleep Calculator mod APK.
2. Save the file in your device s folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B // 5s5x38

To Sleep Calculator from HappyMod APP, you can follow this:
1. Open your browser and the HappyMod APK file from happymod.completedownload.net - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android s and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search Sleep Calculator in HappyMod App.

Why does the app say I have no internet connection? q1as

This issue may occur due to temporary server problems or app glitches. Ensure your device is connected to a stable internet connection.

What should I do if the app is lagging? 4b5en

Lagging can be caused by insufficient device resources. Try closing other apps or restarting your device to improve performance.

Why can't I effects? 4w642l

ing effects may fail due to network issues or server problems. Check your internet connection and try again later.

How can I fix the network issue while using a VPN? g1zt

Sometimes, VPNs can interfere with app connectivity. Try disconnecting the VPN and see if the app works without it.

What can I do if the app keeps crashing? q2j6q

If the app crashes frequently, consider clearing the app cache or reinstalling it to resolve potential bugs.

Why can't I access AI modes in the app? 4z4l1i

AI modes may require a stable internet connection. Ensure your connection is strong and try again.

If AI modes are not accessible, it could be due to server issues or your internet connection. Check if other apps are working properly. If they are, the issue might be with the app itself.

Steps to resolve:
1. Check your internet connection by opening a web browser.
2. Restart your device to refresh the network settings.
3. Open the app again and try accessing the AI modes.

What should I do if the app is not ing templates? 6v4k2t

If templates are not ing, it may be due to a poor internet connection or server issues. Check your connection and try again later.

Why does the app keep saying 'no internet' even with a connection? 5b3o2o

This could be a bug in the app or a temporary server issue. Restarting the app or your device may help resolve this.

Persistent 'no internet' messages can indicate a problem with the app's ability to connect to its servers. Restarting can refresh the app's connection attempt.

Steps to resolve:
1. Close the app completely.
2. Restart your device.
3. Reopen the app and check the connection.

Why does the app crash when importing 4K videos? 1h6ml

The app may crash due to high resource demands when handling 4K videos. Try using lower resolution files for smoother editing.

4K videos require more processing power and memory. If your device is not equipped to handle such high-resolution files, it may lead to crashes.

What should I do if I keep getting network errors? 3i2d3u

Network errors can occur due to unstable internet connections. Try switching to a different network or resetting your router.

Network issues can disrupt the app's functionality. A stable connection is essential for smooth operation, especially when using online features.