minutes
Average sleep onset latency is 10–20 min
Based on 90-minute sleep cycles. You'll complete 5–6 full cycles for a good night's sleep (7.5–9 hours). Waking up between cycles is when you feel most rested.
Sleep Cycle Calculator
Sleep alternates between light, deep, and REM stages in roughly 90-minute cycles. Waking up at the end of a cycle (rather than in the middle of deep sleep) leaves you feeling more refreshed.
- Most adults need 5–6 complete cycles (7.5–9 hours)
- The fall asleep time accounts for the period between lying down and actually sleeping
- Results show bedtimes for 4, 5, and 6 full cycles
- Individual cycle lengths vary; 90 minutes is the commonly cited average