Sleep Cycle Calculator
Wake at the end of a cycle – not in the middle of deep sleep
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What is a Sleep Cycle?
A sleep cycle lasts approximately 90 minutes and consists of four stages:
- Stage 1 (Light Sleep): 5-10 minutes, easy to wake
- Stage 2 (Light Sleep): 20 minutes, heart rate slows
- Stage 3 (Deep Sleep): 20-40 minutes, hardest to wake, body repairs
- REM Sleep: 10-60 minutes, dreaming occurs, memory consolidation
Most adults need 4-6 full cycles per night (6-9 hours of sleep).
How Many Sleep Cycles Per Night?
| Cycles | Total Sleep Time | Feeling Upon Waking |
|---|
| 6 cycles | 9 hours | Fully rested, optimal |
| 5 cycles | 7.5 hours | Rested, good for most adults |
| 4 cycles | 6 hours | Minimum, may feel tired |
| 3 cycles | 4.5 hours | Sleep deprived, not recommended |
FAQs About Sleep Cycles
How long is one sleep cycle?
The average sleep cycle is 90 minutes, but can range from 70 to 120 minutes depending on the individual.
How many sleep cycles per night is normal?
Most adults experience 4-6 complete sleep cycles per night.
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