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Sleep Cycle Calculator
Recommended Wake-up Times
Tip: go to bed a few minutes earlier so you have time to fall asleep. Results are estimates based on the average sleep-cycle length; individual cycles vary.
How to Use the Sleep Cycle Calculator
What is a Sleep Cycle?
A sleep cycle is a natural process that your body goes through while you sleep. Each cycle includes light sleep, deep sleep, and REM (Rapid Eye Movement) sleep. A full sleep cycle usually lasts about 90 minutes. Waking up at the end of a cycle can help you feel more refreshed, alert, and energized, while waking up in the middle of a cycle may leave you feeling tired and groggy.
Why Use a Sleep Cycle Calculator?
- ✓Helps you wake up feeling more refreshed
- ✓Improves focus and productivity
- ✓Supports better mood and mental health
- ✓Easy to use and 100% free
- ✓Great for students, professionals, and anyone
The 4 Stages of Sleep
Each sleep cycle has four stages. Understanding these stages can help you get better sleep.
Frequently Asked Questions
What is the ideal length of a sleep cycle?
About 90 minutes on average, though individual cycles can range from 70 to 120 minutes.
How many hours of sleep do I need?
Most adults need 7–9 hours per night, which is about 5–6 full sleep cycles.
Can I use this calculator to find my bedtime?
Yes. Switch to the Find Bedtime tab, enter the time you want to wake up, and it will show recommended bedtimes.
Is this calculator accurate?
It is an estimate based on the average 90-minute cycle length. Individual sleep cycles vary, so treat results as guidance.
Can I customize the sleep cycle length?
Yes. Use the Average Cycle Length dropdown to choose 80, 90, or 100 minutes.
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Learn More About Sleep
Sleep-cycle calculations are only rough planning aids; sleep needs and patterns vary from person to person. For general public-health sleep information, consult the CDC.