What is the best time to sleep and wake up?

Start from the alarm, not the clock

Advice that names a bedtime for everyone — “be asleep by ten” — ignores the one fact that differs between people: when they have to be up. The useful order is the reverse. Fix the wake-up time first, because it is set by work, school or children and because a consistent wake-up time is what anchors the body clock. Then work backwards.

For an adult the National Sleep Foundation’s range is seven to nine hours; the AASM says seven or more. In whole cycles of about 90 minutes that is five cycles (7 h 30 min) or six (9 h). Add fifteen minutes to fall asleep. For a 6:30 am alarm the arithmetic gives 10:45 pm or 9:15 pm; for 7:00 am, 11:15 pm or 9:45 pm. Every alarm time has its own bedtime page, and the bedtime calculator does the sums live.

Then adjust for your type

People differ in chronotype — the clock time at which their body prefers to sleep. Morning types feel sleepy early and wake early without effort; evening types the opposite; most of us sit in between. Chronotype shifts the window; it does not change its length. An evening type still needs seven to nine hours, just later, and will struggle with a 6:30 alarm in a way a morning type will not.

The practical consequence: if your natural bedtime is midnight and your alarm is 6:30, no schedule will feel good, and the honest options are an earlier bedtime enforced by routine and morning light, or, where the job allows, a later start. Teenagers are the extreme case — puberty pushes the clock later for everyone — which is covered on the teenager page.

What “consistent” buys you

The strongest single finding in this area is that a regular wake-up time improves sleep more than any clever bedtime. The clock is set by light and by routine, and a wake-up that swings by two or three hours between weekdays and weekends produces the grogginess of a time-zone change every Monday. Keep the alarm within about an hour across the week; let the bedtime float by half an hour with how sleepy you are.

Why “before midnight” is a half-truth

The old claim that sleep before midnight counts double has a kernel: deep sleep is concentrated in the first cycles of the night, whenever the night starts. For someone who sleeps 10 pm to 6 am, those deep-sleep cycles fall before midnight. For someone who sleeps 1 am to 9 am, they fall after it, and are no less deep. The clock time is incidental; the position within your own night is what matters.

A worked example

Alarm at 7:00 am. Evening type, so an early bedtime is a struggle. Five cycles back from 7:00, plus fifteen minutes to fall asleep, is 11:15 pm — a realistic lights-out for a night owl and inside the adult range. Six cycles would be 9:45 pm, which is not going to happen. Four cycles, 12:45 am, is six hours and a one-night floor. The 7:00 am page lays out the same options with the timeline.

Questions people ask

Is 10 pm to 6 am a good sleep schedule?

Yes for most adults: eight hours in bed, about 7 h 45 min asleep, and it lines up with five full cycles plus a little slack. The 10:15 pm option lands exactly on five cycles for a 6:00 alarm.

Is it bad to go to bed after midnight?

Not in itself. What matters is total sleep and consistency. A 1 am to 9 am schedule is as sound as 10 pm to 6 am if you can keep it every day — the problem is usually that work does not allow it.

Should I go to bed at the same time every night?

The wake-up time is the one to keep fixed; it anchors the body clock. Bedtime can then vary by half an hour or so with how sleepy you are.