How does this sleep cycle calculator work?
It estimates sleep windows in 90-minute cycles and includes a small wind-down time so you can pick a bedtime or wake time that aligns better with natural cycles.
Free Wellness Tool
Sleep Cycle Calculator
Free sleep cycle calculator. Find ideal bedtime and wake-up times using 90-minute sleep cycles with no signup required.
Questions
How many sleep cycles should I aim for?
Most adults feel best around 4 to 6 full cycles, depending on sleep need, schedule, and recovery demands.
Is this a medical sleep diagnosis?
No. This is a planning tool, not a diagnosis. If sleep issues persist, consult a qualified clinician.