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A quick way to understand who this helps, what it solves, and where it connects next.
Anyone planning bedtimes around sleep cycles.
Using the sleep cycle calculator without installing anything or signing up.
Capture sleep-calculator intent with a fast, browser-side tool that runs 100% locally.
Cleanor Labs
These sections explain the job in plain language and set expectations for what the tool should do well.
The Sleep Cycle Calculator helps you wake up at the end of a sleep cycle rather than in the middle of one, so you feel more refreshed. Enter a wake-up time to see suggested bedtimes, or a bedtime to see suggested wake times. Each suggestion is built from 90-minute cycles with about 15 minutes added to fall asleep, and the 5 to 6 cycle options (roughly 7.5 to 9 hours) are marked as recommended for most adults. Everything runs in your browser. This is general information, not medical advice; see a professional about ongoing sleep problems.
Short answers for the questions people usually have before trying a utility like this.
A full sleep cycle averages about 90 minutes. Waking at the end of a cycle, rather than during deep sleep, tends to leave you feeling more rested, so the tool spaces suggestions in 90-minute steps.
Most people take around 15 minutes to actually fall asleep after getting into bed, so the calculator includes that buffer when working out bedtimes and wake times.
Most adults do best with 5 to 6 complete cycles, about 7.5 to 9 hours of sleep, which is why those options are marked as recommended.
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Plan your night around 90-minute sleep cycles. Pick a wake-up time to see when to go to bed, or a bedtime to see when to wake. Everything runs in your browser.
Each cycle is about 90 minutes, and we add roughly 15 minutes to fall asleep. Waking at the end of a cycle helps you feel more refreshed.
If you want to wake up at this time, go to bed at one of these times:
Most adults do best with 5 to 6 complete cycles (about 7.5 to 9 hours of sleep).