The Korea Wave

Rest & recovery

Sleep Time Calculator

Plan bedtime or wake-up times around 90-minute sleep cycles so you wake up between cycles instead of in deep sleep.

Uses 90-minute sleep cycles plus ~15 minutes to fall asleep.

Suggested bedtimes

4 cycles (~6 h sleep)12:15 AM
5 cycles (~7.5 h sleep)10:45 PM
6 cycles (~9 h sleep)9:15 PM

Five cycles (~7.5 hours) is a common sweet spot, but choose the option that fits your schedule.

These calculators provide general estimates for education only. They do not replace medical advice, diagnosis, or personalized nutrition counseling. Talk with your clinician before changing diet, exercise, or treatment plans.