If you went to sleep right now, when should you wake up to feel refreshed? Science suggests that completing 5 to 6 sleep cycles per night is the key to waking up energized.
Educational Guidance:This calculator provides general estimates based on typical sleep-cycle patterns and an average cycle length of around 90 minutes. Actual sleep cycles can vary in length from person to person and from night to night. The results are intended for educational and informational purposes only. They should not be considered medical advice, diagnosis, or treatment. If you have ongoing concerns about your sleep or sleep quality, consider speaking with a qualified healthcare professional.
I have to wake up at…
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I will go to sleep at…
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Going to bed right this moment?
About Sleep Cycle Hub
How much sleep do you need?
Age group
Age range
Recommended
The stages of sleep
Sleep patterns by age, in detail
Total hours needed is only part of the picture — how that sleep is spread across day and night changes a lot as we grow.