Best Bedtime Calculator
Find the optimal bedtime to wake up feeling refreshed. Based on 90-minute sleep cycle science.
6 cycles (9h)
9:45 PM
5 cycles (7.5h)
11:15 PM
4 cycles (6h)
12:45 AM
Why Timing Matters
Going to bed at the right time ensures you complete full sleep cycles. Waking at the end of a cycle — rather than mid-cycle — helps you feel alert and energized.
Frequently Asked Questions
Best Bedtime Guide
Your bedtime determines how many full sleep cycles you complete before morning. Each cycle lasts ~90 minutes, so timing matters. Aim for 5 cycles (7.5 hours) for optimal rest.