What time should a teenager go to bed?
Last reviewed: 14 September 2026
Teenagers need more sleep than adults and get considerably less. The reason is not attitude — it is a body clock that genuinely moves later at puberty and a school day that does not move with it.
Between 9:00 PM and 10:30 PM on a school night
Teenagers need 8 to 10 hours of sleep a night — more than adults, not less. For a 7:00 AM wake-up, that means lights out somewhere between 8:45 PM and 10:45 PM, with about 9:30 PM as a sensible middle.
The difficulty is that the teenage body clock genuinely runs one to two hours later than a child's, so the bedtime that the arithmetic demands is often not the bedtime the teenager can actually fall asleep at. That mismatch, not laziness, is the real problem.
Teenage bedtime chart
| Wake-up time | For 10 hours | For 9 hours | For 8 hours |
|---|---|---|---|
| 6:00 AM | 7:45 PM | 8:45 PM | 9:45 PM |
| 6:30 AM | 8:15 PM | 9:15 PM | 10:15 PM |
| 7:00 AM | 8:45 PM | 9:45 PM | 10:45 PM |
| 7:30 AM | 9:15 PM | 10:15 PM | 11:15 PM |
| 8:00 AM | 9:45 PM | 10:45 PM | 11:45 PM |
Times include about 15 minutes to fall asleep. Eight hours is the floor of the recommended range, not the target — a teenager consistently on eight hours has no margin at all.
Why teenagers cannot just go to bed earlier
At puberty, the timing of melatonin release shifts later by one to two hours. This is a physiological change, it is close to universal, and it persists until the early twenties. A 16-year-old sent to bed at 9:30 PM will frequently lie awake until 11:00 PM, because their body has not yet produced the hormonal signal that sleep is due.
Since school start times have not moved to match, the result is a structural mismatch that sleep researchers often describe as a permanent, imposed jet lag. Across a term it produces a substantial cumulative deficit, and the associated effects — worse concentration, poorer memory consolidation, low mood, and a higher measured risk of anxiety and depression — are considerably better documented than most people realise.
Simply moving bedtime earlier usually fails, and can make things worse by teaching a teenager that bed is a place where they lie awake. The interventions that work act on the body clock instead: morning light, a consistent wake-up time, and dimmer evenings.
What actually shifts a teenage body clock earlier
- Morning daylight. The strongest lever available. Fifteen to thirty minutes of outdoor light within an hour of waking pulls the clock earlier. Walking part of the journey to school does more than any evening routine.
- A consistent wake-up time, seven days a week. Within about an hour of the school time at weekends. The Saturday lie-in until 1:00 PM is what makes Monday impossible — it pushes the clock two hours later in a single weekend.
- Dim the house after about 9:00 PM. Ambient light in the evening delays melatonin. Lamps rather than overhead lights is a small change with a real effect.
- Phones charge outside the bedroom. The most argued-about rule and the most effective one. The pull is social rather than technological — it is the group chat, not the screen — which is why rules about where the phone sleeps work better than rules about screen time.
- Caffeine cut-off after lunch. Caffeine's half-life is five to six hours, so a 4:00 PM energy drink is still measurably active at 10:00 PM. Energy drinks in particular carry far more caffeine than most teenagers assume.
- Move bedtime in 15-minute steps. If it needs to come forward by 90 minutes, that is a month's work, not a Sunday-night decision.
Bedtimes for each teenage year
The recommended range is the same from 13 to 18, but what gets in the way of it changes a great deal across those years — growth and sport at 14, exams at 15, and a schedule nobody else is setting by 16. Each year has its own bedtime chart:
Signs of a serious deficit
- Sleeping past midday at weekends, every weekend.
- Falling asleep in lessons, or on the journey home.
- Needing caffeine daily to function.
- A marked drop in school performance without a clear cause.
- Persistent low mood or irritability that is noticeably worse in term time.
- Being unable to fall asleep before 1:00 AM even when they try — which, if it persists, may be delayed sleep phase syndrome and is worth a doctor's appointment.
Making the case to a teenager
Health arguments land poorly at this age. Performance arguments land much better, and they happen to be true: sleep is when the day's learning is consolidated into long-term memory, so an hour of revision at 11:30 PM frequently costs more than it adds. The same applies to sport, where reaction time and injury risk both track sleep closely.
It also helps to be honest that the late body clock is real and not their fault. A teenager who has been told for years that they are lazy tends to stop listening; one who is told their biology has shifted and here is how to work with it tends to engage.
Sources. Age-based recommendations are from the National Sleep Foundation’s sleep duration recommendations, the American Academy of Sleep Medicine’s consensus statements on sleep for healthy children and for adults, and the NHS children’s sleep service at Newcastle Hospitals. Sleep stage figures are from published polysomnography data. This page is general wellbeing information, not medical advice — speak to a GP or doctor about persistent sleep problems.
Common questions
How much sleep does a 14, 15, 16 or 17 year old need?
8 to 10 hours a night, for every age from 13 to 18. That is the recommendation from the American Academy of Sleep Medicine, the National Sleep Foundation and the NHS alike — more than the 7 to 9 hours adults need.
Is 10pm to 5am enough sleep for a teenager?
No. That is seven hours, an hour short of the minimum and three short of the top of the range. Run across a school week it accumulates into a deficit that a weekend lie-in does not fully repay.
The 5:00 AM end is usually the part worth questioning. If it is an alarm for a commute or a job, the bedtime has to move to match; if they are waking at 5:00 AM without one and cannot get back to sleep, that is worth raising with a GP.
What is the 10-3-2-1-0 sleep rule?
A popular wind-down checklist counting back from bedtime: no caffeine 10 hours before, no food or alcohol 3 hours before, no work 2 hours before, no screens 1 hour before, and 0 hits of the snooze button in the morning.
It is a memory aid rather than clinical guidance, and the individual numbers are rounder than the evidence behind them. For a teenager the useful parts are the 10 and the 1 — caffeine has a long tail, and the last hour matters. Swap “no work” for “no homework” and ignore the alcohol clause.
Is 12 hours of sleep bad for a 15 year old?
Occasionally, no — a 12-hour night after a heavy week, an illness or a growth spurt is ordinary recovery sleep, and the teenage requirement genuinely rises during the final growth spurt.
As a standing pattern it is worth looking at. Twelve hours every night, or twelve hours that still leaves them tired, can point to poor sleep quality rather than a large sleep need, and persistent oversleeping alongside low mood is worth a GP’s opinion.
Why can’t my teenager fall asleep early?
Because melatonin release shifts one to two hours later during puberty. It is a physiological change, not a behavioural one, and it lasts into the early twenties. Morning daylight and a fixed wake-up time shift it back; an earlier bedtime on its own usually does not.
Is 11pm too late for a teenager?
With a 7:00 AM wake-up it gives under 8 hours, below the recommended minimum. It is an extremely common bedtime, which is why teenage sleep deprivation is so widespread rather than why it is acceptable.
Should teenagers be allowed to sleep in at weekends?
A moderate lie-in helps repay the week’s debt, but a long one pushes the body clock later and makes Monday worse. NHS guidance is to keep weekend and school wake-up times within about two hours of each other, which is the compromise that keeps the clock stable.