Wellness
Sleep Cycle (REM) Wake-Up Calculator
Find the perfect times to fall asleep so you wake up refreshed between REM sleep cycles.
Sleep Cycle (REM) Wake-Up Calculator
Find the perfect times to fall asleep so you wake up refreshed between REM sleep cycles.
Calculations include an extra 15 minutes to account for the average time it takes to fall asleep.
How This is Calculated
Each complete sleep cycle lasts approximately 90 minutes (range 80–110 min). The calculator subtracts multiples of 90 min from the wake-up time, plus a 15-minute sleep onset latency. Waking between cycles (during light N1/N2 sleep) rather than mid-REM produces significantly better subjective alertness.
Disclaimer: This tool provides estimates for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
