About Sleep Calculator
Calculate optimal bedtimes and wake times aligned with natural 90-minute sleep cycles.. Designed for accurate, instantaneous calculations with zero wait time.
Formula
Sleep Cycle = 90 Minutes + 14 Minutes Average Sleep Onset
Example Calculation
To wake refreshed at 6:30 AM, optimal bedtimes are 9:16 PM (6 cycles) or 10:46 PM (5 cycles).
How to Use
- Enter your values into the form fields above.
- The calculation updates immediately in real time.
- Inspect the main summary and secondary breakdowns below.