Wake up refreshed — find your perfect sleep and wake times.
Calculator Mode
Includes a 14-minute average time to fall asleep.
Suggested bedtimes to wake at 07:06 AM
6 sleep cycles
9h of sleep
5 sleep cycles
7h 30m of sleep
4 sleep cycles
6h of sleep
Sleep cycle breakdown
How it works
The Sleep Cycle Calculator helps you find the ideal bedtime or wake-up time by aligning with your natural 90-minute sleep cycles. Waking between cycles — rather than mid-cycle — dramatically reduces grogginess. Enter your desired wake-up time or bedtime and instantly see optimized options for 4, 5, or 6 complete cycles, with a 14-minute fall-asleep buffer already factored in.
One complete sleep cycle lasts approximately 90 minutes and includes light sleep (N1 & N2), deep slow-wave sleep (N3), and REM sleep. Most adults complete 4–6 cycles per night.
14 minutes is the average sleep onset latency — the time it takes a healthy adult to fall asleep after lying down. The calculator adds this buffer so your bedtime accounts for the time spent falling asleep, not just the cycles themselves.
Occasionally, yes — but not long-term. 4 cycles (6 hours) is listed as the minimum because sleep debt accumulates quickly below this threshold. Most adults need 5–6 cycles (7.5–9 hours) for optimal cognitive function, mood, and physical recovery.
That's a good sign! It likely means you completed a full cycle and woke during a light sleep phase. Try adjusting your bedtime so the cycle count aligns with when you naturally feel rested — your body's rhythm is the best guide.