ðŸ˜ī Sleep Cycle Calculator

Based on 90-minute sleep cycles — wake up between cycles, not in the middle of one.

📘 How to Use This Tool

Find the ideal bedtime or wake-up time based on 90-minute sleep cycles.

  1. Choose whether you want to calculate a bedtime (based on when you need to wake up) or a wake-up time (based on when you're going to bed).
  2. Enter your target wake-up time or bedtime.
  3. Click Calculate to see a few recommended times, each aligned to a full number of 90-minute sleep cycles.
  4. Aim to fall asleep around 15 minutes after your chosen bedtime, since it takes most people that long to actually fall asleep.

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