What is the Sleep Cycle Calculator?

The Sleep Cycle Calculator helps you optimize your sleep schedule by aligning it with natural 90-minute sleep cycles. Whether you want to calculate the ideal bedtime to wake up refreshed or determine the best wake-up times based on when you go to bed, this tool gives practical suggestions for 4–6 full sleep cycles. By following these times, you can wake up feeling more alert, avoid grogginess, and improve overall sleep quality.

How to Use:

1. Enter Current Time or Desired Bedtime: Input either the time you plan to go to bed or the time you want to wake up.
2. Select Calculation Mode: Choose whether you want to calculate “I want to Wake Up at” or “I want to Sleep at.”
3. Click “Calculate”: The tool computes a list of suggested bedtimes or wake-up times based on 90-minute sleep cycles.
4. Review Result: The output shows multiple optimal times to sleep or wake up, along with a tip to wake up at the end of a sleep cycle for a refreshed morning.