Sleep Calculator

Find your ideal sleep schedule based on 90-minute sleep cycles.

Configure Schedule

Select when you want to sleep or wake up.

What is your goal?

Wake-up Time

Ready to optimize your sleep?

Select when you want to wake up or go to bed, and we'll calculate the perfect times based on typical hour durations.

What is this tool?

The Sleep Calculator is a tool designed to help you optimize your sleep schedule by calculating exactly when you should go to bed or wake up. Instead of just aiming for a total number of hours, it focuses on completing full 90-minute sleep cycles, ensuring you wake up energetic rather than groggy.

How cycles work

The 90-Minute Rule

A typical sleep cycle lasts roughly 90 minutes. You transition from light sleep to deep sleep, into REM sleep, and back. If your alarm rings in the middle of a deep sleep cycle, you often experience 'sleep inertia' (feeling tired and disoriented). Waking up between cycles prevents this.

Frequently Asked Questions