Sleep Time Calculator
Enter a wake-up or bedtime to get optimal sleep recommendations based on 90-minute sleep cycles.
Sleep Cycle Guide
Sleep consists of roughly 90-minute cycles. Waking at the end of a cycle helps you feel more refreshed. Adults are recommended 7โ9 hours (5โ6 cycles).
N1Light sleep (5โ10 min) โ falling asleep
N2Light sleep (20 min) โ body temperature and heart rate drop
N3Deep sleep (20โ40 min) โ physical recovery
REMREM sleep โ dreaming, memory consolidation, cognitive recovery