📐 Sleep Calculator Formula
Counts backwards in 90-minute cycles + 15 mins to fall asleep.
Sleep Calculator
Enter the time you need to wake up, and we'll calculate the best times to fall asleep to complete full 90-minute sleep cycles.
Input Parameters
Hr
Min
Results
Optimal Bedtime (9 hours)21.45
Optimal Bedtime (7.5 hours)23.15
Visual Breakdown
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📝 Example
To wake up at 7:00 AM feeling refreshed, sleep at 11:15 PM (5 cycles) or 9:45 PM (6 cycles).
✅ Benefits
- •Prevents waking up tired
- •Optimizes REM sleep
❓ Frequently Asked Questions
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