Sleep Cycle Calculator
Find recommended bedtimes based on your wake-up time and 90-minute sleep cycles.
Tool
How it works
The tool subtracts full 90-minute cycles from your desired wake-up time.
It includes a 15-minute average sleep latency before cycle timing starts.
Output provides practical bedtime options for 4, 5, or 6 cycles.
Examples
If you need to wake at 7:00 AM, the tool gives several bedtime options the night before.
Choose a cycle count based on your sleep target and schedule constraints.
FAQ
Why 90-minute cycles?
It is a common sleep-cycle estimate used for simple bedtime planning.
Is this medical advice?
No. This is a planning aid, not medical guidance.
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