How much sleep does a teenager need?

The number, from two panels

In 2015 the National Sleep Foundation convened a multidisciplinary panel that reviewed the evidence for each age group and voted on three bands. For teenagers aged 14 to 17 the recommended range is 8 to 10 hours per night. Seven hours, and eleven, were judged “may be appropriate” for some individuals; under seven and over eleven were not recommended.

A year later the American Academy of Sleep Medicine published its own consensus for children and adolescents and arrived at the same 8 to 10 hours, for a slightly wider age band of 13 to 18. The CDC’s summary table uses the AASM figures. Two groups, different methods, same answer — which is as close to settled as this kind of recommendation gets. The teenager sleep-needs page shows the full bands against every other age.

Why the biology fights the school bell

Around puberty the body’s clock shifts later. The evening rise in melatonin, the hormone that signals night to the brain, comes an hour or two later than it did in childhood, and the morning falls correspondingly late. A sixteen-year-old who cannot feel sleepy before 11 pm is not being difficult; that is the typical timing for the age. The problem is that school mornings did not move.

Put the two together: a body that is ready for sleep at 11 pm and an alarm at 6:30 am gives seven and a half hours in bed and, after falling asleep, about seven hours of sleep — below the range. Surveys consistently find that most high-school students sleep less than eight hours on school nights. It is the most predictable sleep shortfall in the population, and the fix the research points to — later school start times — is not one a family controls.

What a family can control

The bedtime arithmetic still helps. For a 6:30 am alarm, eight hours of sleep means lights out by 10:15 pm after fifteen minutes to fall asleep; ten hours means 8:15 pm. The bedtime page for 6:30 am gives the cycle-aligned options, and the rest of the bedtime pages cover every alarm time.

The lever with the best evidence is the wake-up time, kept steady across the week. Sleeping until noon on Sunday feels like recovery and in practice pushes the clock later still, making Monday’s 6:30 harder. A weekend lie-in of an hour or so is a reasonable compromise; three hours is a reset in the wrong direction.

Light is the other lever. Bright light in the morning pulls the clock earlier; bright screens late at night push it later. The effect is modest per night and adds up over weeks.

When the number is not the issue

If a teenager gets eight to ten hours and is still exhausted, or lies awake for long stretches most nights, the problem is not the schedule. Persistent trouble falling asleep, loud snoring, or daytime sleepiness that interferes with school are reasons to talk to a doctor. This site covers timing and duration; it does not cover treatment.

Questions people ask

Is 7 hours enough for a 15 year old?

Not by the recommendations. Seven hours is in the NSF panel's 'may be appropriate' band for teenagers, below the 8–10 recommended; the AASM range is also 8–10.

Is 6 hours enough for a 14 year old?

No. Six hours is below both panels' ranges and in the NSF panel's not-recommended band for ages 14–17.

Why can't my teenager fall asleep before 11?

Puberty shifts the body clock later by an hour or two; melatonin rises later in the evening. It is biology, not defiance, and it is why early school start times are a documented problem.