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Free Sleep Calculator — Find Your Ideal Bedtime & Wake-Up Time
Find the best times to sleep or wake up based on 90-minute sleep cycles.
About Sleep Calculator
Based on the science of 90-minute sleep cycles, this calculator suggests optimal bedtimes (if you know when you need to wake up) or wake-up times (if you know when you're going to bed). Waking up between cycles rather than during deep sleep helps you feel more refreshed. Also accounts for the average 15 minutes it takes to fall asleep, giving you truly actionable times.
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