Sleep Calculator
Sleep happens in roughly 90-minute cycles. Waking up at the end of a cycle rather than in the middle of one tends to feel less groggy.
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How this works
Counts back or forward in 90-minute increments (5–6 cycles, plus ~15 minutes to fall asleep) from your given time.
Medical disclaimer
This tool provides general health information based on published formulas and guidelines. It is not a medical diagnosis and does not replace advice from a qualified doctor. If you have a health concern, please consult a physician or book a consultation on IMCURE.
Frequently asked questions
How many cycles should I aim for?
Most adults feel best after 5–6 full cycles, roughly 7.5–9 hours of sleep.
