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Sleep Cycle Calculator
Calculate optimal wake-up or bedtimes based on 90-minute sleep cycles to wake up refreshed.
100% BROWSER-BASED
Go to bed at:
09:45 PM
6 cycles = 9 hours
11:15 PM
5 cycles = 7.5 hours
12:45 AM
4 cycles = 6 hours
Pro tip: Try to wake up at the same time every day, even on weekends. Consistent sleep schedules improve sleep quality and daytime energy.
/ HOW TO USE
How to Use Sleep Cycle Calculator
This tool runs entirely in your browser. Upload your file, make your changes, and download the result. Your files never leave your device — everything is processed locally for maximum privacy.
/ FEATURES
Key Features
100% Client-Side Processing
No File Size Limits
Completely Free
Privacy Focused
Instant Results
Works Offline
/ USE CASES
Common Use Cases
- —Wake up feeling refreshed, not groggy
- —Plan bedtime for early morning commitments
- —Understand your sleep cycles
- —Improve sleep quality
/ FAQ
Frequently Asked Questions
What is a sleep cycle?
A complete sleep cycle is approximately 90 minutes, moving through light sleep, deep sleep, and REM stages. Waking between cycles leaves you feeling more refreshed.
Why 15 minutes?
We add 15 minutes as the average time it takes to fall asleep after getting into bed.
/ YOUR PRIVACY
Your Privacy is Guaranteed
Unlike other tools that upload your files to servers, ToolBox processes everything locally in your browser.
No server uploads
Instant processing
Works offline