Android: A full 90-minute sleep cycle can ensure you wake up energised. 90Night makes it simpler for you to get this sleep by letting you choose the best time to wake up.
The free Android app asks you to input the time you want to sleep and accordingly gives you a screen with different timings based on the 90-minute cycle. Choose the time you want and 90Night will automatically set an alarm for it.
In the app's settings, you can also add the amount of time it usually takes you to fall asleep so that 90Night can take that into account when giving you timings. Overall, it is a much easier process than setting an alarm yourself.
The app also works the other way around so that you can set the time you want to wake up and 90Night will give you options for what time you should go to sleep.
90Night (Free) [Google Play Store]