Sleep calculator
Sleep moves in roughly 90-minute cycles and waking at the end of a cycle feels easier. About 15 minutes for falling asleep is added. Adults need 7–9 hours (5–6 cycles); cycle length varies, so treat this as an estimate.
Sleep moves in roughly 90-minute cycles and waking at the end of a cycle feels easier. About 15 minutes for falling asleep is added. Adults need 7–9 hours (5–6 cycles); cycle length varies, so treat this as an estimate.