Wake up feeling refreshed by aligning your sleep with natural 90-minute cycles. Our Sleep Calculator tells you the best times to go to bed or set your alarm.
How to Use
- Choose your mode — “I want to wake up at…” or “I want to go to bed at…”
- Enter your target time
- See recommended times based on 90-minute sleep cycles
- Pick the option that gives you 5-6 complete cycles (7.5-9 hours)
Common Use Cases
- Morning people: Find the ideal bedtime for your alarm time
- Night owls: Calculate when to wake up based on your bedtime
- Shift workers: Optimize sleep around irregular schedules
- Students: Plan sleep around study and class schedules
Frequently Asked Questions
Why 90-minute cycles? Each sleep cycle lasts roughly 90 minutes and includes light sleep, deep sleep, and REM sleep. Waking between cycles feels more refreshing.
How many cycles do I need? Most adults need 5-6 cycles (7.5-9 hours). Some function well on 4 cycles (6 hours).
Try our free Sleep Calculator now.
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