This widget calculates the best times for you to wake up, without the need of heavy features like other apps on the Play Store. Whether you want to nap or feel well rested for the next day, this widget will tell you when each of your sleep cycles end to determine the optimal time to set your alarms with simplicity and elegance.

Includes:
• Themes
• Customizable settings
• Adjustable for how long it takes you to fall asleep

If you would like more information on sleep studies and REM cycles, see the documentation on the National Institute of Health (US Govt.) webpage.
https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Understanding-Sleep#4