Sleep Calculator
About Sleep Cycles
A complete sleep cycle lasts about 90 minutes. It typically takes 15 minutes to fall asleep. Waking up between cycles helps you feel more refreshed. Most adults need 4-6 cycles (6-9 hours) per night.
Enter a time and click Calculate to see recommended bed times
About the Sleep Calculator
A sleep calculator helps you determine the optimal bedtime or wake-up time based on sleep cycles. Each sleep cycle lasts approximately 90 minutes, and waking up between cycles helps you feel more refreshed and energized. Use this tool to plan your sleep schedule and wake up feeling your best. Our Sleep Calculator takes the guesswork out of sleep scheduling. Simply input when you want to wake up, and it will calculate the optimal times to fall asleep based on completing full sleep cycles. Alternatively, if you're going to bed now, it can tell you the best times to set your alarm.