Enter your sleep time and wake time – the tool instantly shows your total sleep hours, number of cycles, deep sleep estimate, and sleep quality rating. No AI, no database, no tracking – everything runs in your browser.
Sleep Rhythm Checker
Calculate your sleep cycles, deep sleep, ideal wake-up time, and sleep quality. No AI — pure logic.
How This Sleep Checker Works?
- Every sleep cycle ≈ 90 minutes
- Deep sleep ≈ 22% of total
- More cycles = better cognitive recovery
- Tool uses pure time-based logic
This is a clean, accurate estimation model.
FAQs:
1. How accurate is the sleep cycle calculation?
It follows the standard 90-minute cycle model used in sleep science.
2. Does this need AI?
No. 100% logic-based.
3. Do you store my data?
No. Everything is local.
4. Can I use it for naps?
Yes — anytime you enter two times.
5. Is this tool free?
Yes, fully free on IluvTool.