Sleep Calculator
Wake up between sleep cycles to feel more rested. Based on ~90-minute cycles plus 15 min to fall asleep.
How to use
Choose mode (wake or bedtime) and enter time; see suggested times for 4-6 cycles.
Formula
Each cycle ~90 min; add 15 min to fall asleep.
Examples
- Wake at 07:00 → Bed at 23:00 (6 cycles), 00:30 (5), 02:00 (4)
Important notes
General guide; individual sleep needs vary.
Frequently asked questions
How many cycles?
5-6 cycles (7.5-9h) is typical for adults.