Find the best time to sleep or wake up based on 90-minute sleep cycles.
Time is considered in 24-hour format (e.g., 22:00 = 10 PM).
The Sleep Cycle Calculator helps you figure out the best time to go to bed or wake up based on your body’s natural sleep patterns. Each full sleep cycle lasts about 90 minutes, and completing full cycles helps you wake up refreshed and alert.
By syncing your sleep with these natural cycles, you can avoid waking up mid-cycle and feel more energetic throughout the day. This tool helps you plan your bedtime or wake-up time for quality rest.