Time to fall asleep
min
How it works
A complete sleep cycle lasts about 90 minutes and includes all stages from light sleep to deep sleep and REM. Waking at the end of a cycle helps you feel more alert and refreshed.
The calculator adds your fall-asleep time and finds times that align with complete cycles.
Optimal (5-6 cycles)
Good (4 cycles)
Minimal (3 cycles)