FitSleep

Контролируйте свой сон, свою историю деятельности от Google Fit.

No more tedious data collecting just to analyze your sleep cycle. No wristbands, no manual inputting, no phone lying next to you during sleep.

App takes your activity from Google Fit and looks for sleep, thus it requires Google Fit. Also the longer you use it, the more accurate results are (app analyzes up to 4 weeks).