Free health tool
Sleep Cycle Calculator
Find possible wake-up or bedtime targets based on 90-minute sleep cycles.
Runs locally in your browser. No signup needed.
Why use this?
Planning around sleep cycles can make waking feel easier for some people. Treat it as a rough guide.
Quick tips
- Runs locally in your browser.
- Use the result as a starting point, then adjust for your context.
- Bookmark this tool if it saves you time.