Live tool/tool/sleep-cycle-calculator
Sleep Cycle Calculator
Back-calculate bedtime targets from wake time, cycle count, and sleep latency using a simple sleep-cycle model.
HealthSleepLifestyle
Inputs
Back-calculate bedtime.
Bedtime targets
6 cycles: in bed by 21:45
5 cycles: in bed by 23:15
4 cycles: in bed by 00:45
Estimate
This uses 90-minute cycles and a fixed sleep-latency assumption. Real sleep architecture varies, so treat it as a planning aid rather than a guarantee.