Sleep Cycle Calculator
Estimate sleep cycle from your measurements.
Loading calculator…
What this tool does
Estimate sleep cycle from your measurements. Sleep cycles vary, not fixed at 90 minutes. Prioritize adequate total sleep; this is not treatment for sleep disorders.
How to use the Sleep Cycle Calculator
- Enter or select wake-up time (hh:mm).
- Enter or select sleep cycles.
- Enter or select assumed cycle minutes.
- Enter or select minutes to fall asleep.
- Read the calculated result; change any measurement to compare alternatives.
Formula
bedtime=wake time−cycles×cycle minutes−sleep latency (wrap at midnight)
- wake
- Wake-up time (HH:MM)
- cycles
- Sleep cycles
- cycle
- Assumed cycle minutes
- fall
- Minutes to fall asleep
Sleep cycles vary, not fixed at 90 minutes. Prioritize adequate total sleep; this is not treatment for sleep disorders.
Worked example
For sleep cycle calculator, the following measurements illustrate the exact method: Wake-up time (HH:MM): 07:00; Sleep cycles: 5; Assumed cycle minutes: 90; Minutes to fall asleep: 15.
Inputs
- Wake-up time (HH:MM)07:00
- Sleep cycles5
- Assumed cycle minutes90
- Minutes to fall asleep15
Result
- Illustrative bedtime23:15
Results explained
- Illustrative bedtime
- Illustrative bedtime from the formula above. Sleep cycles vary, not fixed at 90 minutes. Prioritize adequate total sleep; this is not treatment for sleep disorders.
Frequently asked questions
bedtime=wake time−cycles×cycle minutes−sleep latency (wrap at midnight)
Sleep cycles vary, not fixed at 90 minutes. Prioritize adequate total sleep; this is not treatment for sleep disorders.
No. These are general-information estimates, not diagnosis, treatment, fertility advice or exercise clearance. Consult a qualified health professional.
Individual physiology, measurement technique and health conditions may cause large differences from model estimates.
No. BAC estimates never establish that driving is safe or legal; do not drive after drinking.