Sleep Cycle Calculator
Find the best bedtime or wake-up time based on 90-minute sleep cycles. Wake up refreshed every time.
Frequently Asked Questions
- What is a sleep cycle?
- A sleep cycle is approximately 90 minutes and includes light sleep, deep sleep, and REM sleep. Waking between cycles feels more natural.
- How many sleep cycles do I need?
- Most adults need 5–6 cycles (7.5–9 hours) per night for optimal rest.