Sleep Cycle & Circadian Optimizer
Calculate the best time to fall asleep or wake up based on natural 90-minute REM & NREM sleep cycles to wake up energized.
🌙 Sleep Schedule Mode
10 min
15 min (Avg)
20 min
30 min
min
Optimal 90-Min Sleep Cycle Options
The Science of 90-Minute Sleep Cycles
A standard human sleep cycle lasts approximately 90 minutes, cycling through Light Sleep (NREM Stage 1 & 2), Deep Slow-Wave Sleep (NREM Stage 3), and Rapid Eye Movement (REM) dream sleep.
Waking up in the middle of Deep Sleep leaves you feeling groggy (sleep inertia), whereas waking at the end of a completed 90-minute cycle ensures you feel fresh and alert.