Sleep Cycle Calculator & Bedtime Finder
Stop waking up tired. Calculate the perfect time to go to bed or wake up based on 90-minute sleep cycles. Avoid sleep inertia and start your day refreshed.
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- Cool-touch surface (Does not absorb heat)
- Non-slip texture (Tumbled finish)
- Frost and weather resistant
This tool is for educational purposes only. Sleep needs vary by individual. Based on sleep cycle research (NREM/REM 90-min cycles).
Reference: Harvard Medical School - Division of Sleep Medicine
Frequently Asked Questions
What is the best time to sleep?
The best time depends on your wake-up goal. You should aim to complete 5 or 6 full sleep cycles (approx. 7.5 to 9 hours) to wake up feeling rested.
What is Sleep Latency?
It represents the time it takes to actually fall asleep after getting into bed. The average person takes 15 minutes.
Is 6 hours of sleep enough?
For most adults, 7-9 hours is recommended. However, 6 hours (4 cycles) is better than 7 hours (interrupted cycle) because waking up at the end of a cycle prevents grogginess.