How it works: Sleep cycles last about 90 minutes. Waking up between cycles (not during) helps you feel more refreshed. It takes about 15 minutes to fall asleep.
About Sleep Calculator
Calculate the best times to sleep and wake up based on sleep cycles. Each cycle lasts about 90 minutes. Wake up between cycles to feel refreshed.
How to Use Sleep Calculator
Enter your data in the input field above
Configure any options as needed
Click the action button to process
Copy or download your results
Benefits of Sleep Calculator
Completely free to use with no registration required
Works instantly in your browser - no downloads needed
Your data is processed locally for privacy
Mobile-friendly and works on all devices
No limits on usage
Frequently Asked Questions
Find optimal bedtime and wake-up times.
Yes, Sleep Calculator is completely free to use. No registration or payment is required.
Yes, your data is processed in your browser and is not stored on our servers.
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