😴 Sleep Calculator

Find optimal sleep and wake times.

Wake up at... Go to bed at...

Time

Best times (complete 90-min cycles):

Sleep Cycles = 90 Minutes Each

Most adults need 5–6 cycles (7.5–9 hrs). Waking at end of a cycle = more refreshed.

Tired after 8 hours?

You may be waking mid-cycle. Shift alarm 15–30 min to align with a cycle end.