How much sleep does a child need? Hours by age, toddler to teen

The recommended amount is a range, and it is wider than most parents expect. The American Academy of Sleep Medicine (AASM, the professional body for sleep doctors in the United States) sets out consensus figures of 11 to 14 hours in every 24 for children aged 1 to 2, 10 to 13 hours for ages 3 to 5, 9 to 12 hours for ages 6 to 12 and 8 to 10 hours for teenagers aged 13 to 18 (AASM consensus statement). For children under six, naps count towards the total.

Those ranges were agreed by an expert panel after reviewing 864 published papers, not measured in a trial (AASM). They describe what suits most healthy children, not a number your child must hit. With a three-hour spread at every age, the more useful question is whether your child is functioning well during the day. Below is how to judge that, what the evidence says short sleep does, why teenagers drift late, and where guidance from the HSE (Health Service Executive, Ireland’s public health service) runs out.

For adult sleep ranges and insomnia guidance, see our separate adult sleep guide.

How many hours of sleep does a child need at each age?

The AASM ranges, all per 24 hours (AASM):

• Ages 1 to 2: 11 to 14 hours, including naps.
• Ages 3 to 5: 10 to 13 hours, including naps.
• Ages 6 to 12: 9 to 12 hours.
• Ages 13 to 18: 8 to 10 hours.

The HSE gives its own figure for younger children: about 11 to 12 hours of sleep a night for ages 2 to 5, with one daytime nap for the younger end of that band (HSE). That is not a rival number. The HSE counts night-time sleep and treats the nap separately, while the AASM counts everything in the day. Add an hour’s nap to the HSE night figure and you land inside the AASM range.

Two things follow. A five-year-old sleeping 10 hours and one sleeping 13 hours can both be fine. And sleep need falls with age but does not vanish: a sixteen-year-old still sits in the 8 to 10 hour band, which many teenagers do not reach on a school night, as the section on teenagers shows.

How can you tell if your child is actually getting enough?

Watch the day rather than the clock. A child who wakes without a battle most mornings, holds their mood through the afternoon and is not visibly drowsy in class is probably getting what they need, wherever they sit in the range. A child who has to be dragged out of bed every school day, is irritable or wired by late afternoon, or whom a teacher describes as sleepy is the one to look at, even if the hours look fine on paper.

The HSE offers one concrete marker for children aged 2 to 5: they should fall asleep within 30 minutes of going to bed (HSE). If they routinely lie awake far longer, the HSE’s advice is to use a later bedtime for a while so they do fall asleep within 30 minutes, then put them to bed 15 minutes earlier every few nights until you reach the bedtime you want, keeping the same morning wake-up time throughout (HSE).

The research backs the “watch the day” approach. A review published in 2010 pooled three separate meta-analyses (a meta-analysis combines the results of many studies into one overall estimate) of school performance, the largest covering 19,530 students. Daytime sleepiness had the strongest link to school results, ahead of sleep quality and ahead of hours slept, and all three links were small (Dewald and colleagues). So do not expect an extra hour to transform exam results. But a child who is sleepy in class is telling you something the bedtime chart is not.

What does too little sleep do to children and teenagers?

The AASM panel concluded that regularly sleeping less than the recommended range is associated with attention, behaviour and learning problems, and with a higher risk of accidents, injuries, high blood pressure, obesity, diabetes and depression. In teenagers specifically, insufficient sleep is associated with self-harm and suicidal thoughts (AASM). These are associations drawn from observational studies, so they show that short sleep and these problems travel together, not that one straightforwardly causes the other.

On weight, the best evidence is a meta-analysis of 25 prospective cohort studies (studies that follow children forward in time) covering 56,584 children over an average of 3.4 years. Children in the shortest-sleeping group, at about 10 hours, were 76% more likely to become overweight or obese than the longest sleepers at about 12.2 hours, and each extra hour of sleep a day was associated with a 21% lower risk (Fatima and colleagues). The authors themselves call the relationship modest, and because families who sleep well may differ in other ways, the extra hour cannot be read as a promise.

On mood and behaviour, there is one small randomised trial worth knowing about. Researchers took 34 healthy children aged 7 to 11 with no sleep problems and had some go to bed earlier and others later on school nights. Those who gained a cumulative 27 minutes of sleep showed measurable improvements in emotional lability and restless, impulsive behaviour as rated by teachers who did not know which group each child was in, while those who lost 54 minutes got measurably worse (Gruber and colleagues). It is a tiny, short trial of children without problems, so it cannot be stretched far. What it does suggest is that surprisingly small shifts in bedtime show up in the classroom.

Why do teenagers stay up late and struggle to get up?

Partly biology. Researchers describe adolescence as a “perfect storm” for sleep: the body’s internal clock and sleep-pressure systems mature in a way that pushes sleep later, at the same time as homework, social life and phones pull in the same direction (Crowley and colleagues, narrative review). A teenager who cannot get to sleep at ten is not simply being awkward, though the social pressures are real too.

The result is visible across countries. An analysis of 165,793 adolescents in 24 European and North American countries, Ireland among them, found average school-day sleep ranged between 7:47 and 9:07 hours depending on the country, and the share meeting sleep recommendations on school days ranged between 32% and 86% (Gariépy and colleagues). In every country, older teenagers slept less and went to bed later on school days than younger ones. The published summary does not break out an Irish figure.

The obvious policy answer is later school starts, and the evidence there is thinner than campaigners suggest. A Cochrane review (an independent, rigorous type of evidence review) found 11 studies covering 297,994 students. Six of them reported that later starts increased how much teenagers slept, but the reviewers rated the overall evidence as very low quality and said they could not determine the effects with any confidence (Cochrane). None of the studies was Irish.

Which bedtime habits actually help — and do screens matter?

For young children, a consistent bedtime routine has the cleanest support. A survey of mothers of 10,085 children up to age 5, from the UK and US to Japan and India, found that a regular routine was associated with earlier bedtimes, faster falling asleep, fewer night wakings and longer sleep. The more nights a week the routine was used, and the younger it was started, the better the reported sleep (Mindell and colleagues). It is parent-reported and observational, so it cannot prove the routine is doing the work, but it points the same way as the HSE advice.

The HSE says a bedtime routine might take about 30 to 45 minutes and should be done the same way at about the same time each night, avoiding screens such as mobile phones or TV (HSE). That page is written for children from birth to age 2, but the principle carries.

Screens are where the evidence is loud but limited. A meta-analysis of 20 cross-sectional studies covering 125,198 children, average age 14.5, found that using a phone or tablet at bedtime went with an odds ratio of 2.17 for inadequate sleep (an odds ratio compares the odds in one group with another, so 2.17 means roughly double the odds), along with worse sleep quality and more daytime sleepiness. Even having a device in the bedroom without using it was associated with higher odds of too little sleep, an odds ratio of 1.79 (Carter and colleagues). Every study was a snapshot in time, so it cannot show which way the arrow runs. Poor sleepers may reach for the phone more.

The trial evidence is more modest. A meta-analysis of 11 experimental studies with 4,656 children aged 2 to 13 found that programmes to cut screen use reduced screen time by about 33 minutes a day and increased sleep by about 11 minutes a day (Martin and colleagues). The authors could not say whether the screen cut directly caused the extra sleep. Eleven minutes is not nothing, but it is not the transformation the cross-sectional numbers imply.

The practical version: a fixed bedtime and wake time, a short wind-down that looks the same every night, and devices charged outside the bedroom. Those three cost nothing and have the best evidence behind them.

What does the HSE say, and where does Irish guidance stop?

For ages 2 to 5, the HSE says a child needs about 11 to 12 hours of sleep a night, advises avoiding naps after 3.30pm so the child is ready to sleep by 7pm to 9pm, and suggests any time between 7pm and 8pm is a good time to start the bedtime routine (HSE).

After that, the trail goes cold. The HSE’s sleep pages cover babies, toddlers, preschoolers, naps, bedtime routines and nightmares. There is no HSE page on sleep for primary-school children or teenagers. For anyone over five, Irish parents are working from the international consensus figures above, which is reasonable, but worth knowing.

When should you talk to your GP about your child’s sleep?

The HSE’s specific triggers concern night-time disturbances. Talk to your GP (general practitioner, your family doctor) or public health nurse if your child’s nightmares are very disturbing or keep happening, and talk to your GP if your child is having night terrors a few times every night or most nights (HSE).

Beyond that, general good sense applies rather than a published Irish rule. Loud, regular snoring or pauses in breathing during sleep, a child who is persistently sleepy in the day despite a reasonable bedtime, or sleep problems that are clearly hurting school or mood are all worth a GP appointment. For teenagers, given the association between short sleep and low mood and self-harm noted by the AASM, a big change in sleep alongside a change in mood should not be waited out.