Children need anywhere from 8 to 17 hours of sleep per day, depending on their age. Newborns need the most, teenagers need the least, and the ranges shift significantly at each developmental stage. These aren’t rough estimates. Both the American Academy of Pediatrics and the National Sleep Foundation publish specific hour ranges tied to age groups, and falling consistently short of them carries real consequences for a child’s brain development, mood, and physical growth.
Sleep Needs by Age
Here are the recommended sleep durations, which include naps for younger children:
- Newborns (0–3 months): 14 to 17 hours
- Infants (4–12 months): 12 to 16 hours, including naps
- Toddlers (1–2 years): 11 to 14 hours, including naps
- Preschoolers (3–5 years): 10 to 13 hours, including naps
- School-age children (6–12 years): 9 to 12 hours
- Teenagers (13–18 years): 8 to 10 hours
These are 24-hour totals. For a 10-month-old, that 12 to 16 hours includes both overnight sleep and daytime naps. For a 7-year-old, the 9 to 12 hours is purely nighttime sleep since most children have stopped napping by then. Some kids genuinely function well at the lower end of their range, while others need every minute at the upper end. An additional hour on either side may be appropriate depending on the child.
When Naps Phase Out
Naps are a significant chunk of total sleep for babies and toddlers, and parents often wonder when they should expect naps to disappear. By age 2, most toddlers are down to a single nap per day. At age 3, some children still nap and some don’t. Most toddlers stop napping between ages 3 and 4, and by age 5, 94% have dropped naps entirely. Fewer than 2.5% of toddlers stop napping before age 2, so if your 18-month-old is resisting naps, they’re likely overtired rather than truly done with daytime sleep.
When a child drops their nap, bedtime usually needs to shift earlier to make up for the lost sleep. A preschooler who was napping for an hour and sleeping 10 hours at night still needs 10 to 13 hours total, so an earlier bedtime helps bridge the gap.
Why Sleep Matters More for Growing Brains
Sleep isn’t just rest for children. It’s when their bodies do some of their most important developmental work. Growth hormone release ramps up significantly during sleep, particularly during the deep, slow-wave stages that dominate the first half of the night. The hormone that triggers growth hormone release also promotes deeper sleep, creating a cycle where good sleep supports growth and growth signals support better sleep. In rare genetic conditions where this system is impaired, both sleep quality and physical growth are severely reduced.
The brain effects are just as striking. A large NIH-supported study found that children who regularly slept fewer than nine hours per night had measurably less grey matter in brain areas responsible for attention, memory, and impulse control compared to children with healthy sleep habits. These weren’t subtle differences visible only on a scan. The same children showed more impulsivity, aggression, anxiety, and depression. They also performed worse on tasks involving decision-making, problem-solving, and working memory. These patterns held even after accounting for other factors in the children’s lives.
Why Teenagers Stay Up Late
If your teenager can’t seem to fall asleep before 11 p.m., biology is partly to blame. During puberty, the body’s internal clock shifts later. Melatonin, the hormone that signals sleepiness, begins rising later in the evening as children move through puberty. This isn’t laziness or poor discipline. Laboratory studies confirm that pubertal stage is directly associated with later circadian timing.
The practical problem is that school start times don’t shift along with a teenager’s biology. Most teens need 8 to 10 hours, but if they can’t fall asleep until 11 p.m. and the alarm goes off at 6:30 a.m., they’re getting 7.5 hours at best. The gap between weekend and school-night bedtimes averages 1 to 2 hours for most adolescents, with older teens showing larger differences. That weekend “sleeping in” isn’t indulgence. It’s their body trying to recover the sleep it’s wired to need.
Screens and Sleep Timing
Screen use before bed is one of the most common and fixable obstacles to children getting enough sleep. The blue light from phones, tablets, and laptops suppresses melatonin production in a dose-dependent way. In one study, two hours of reading on an LED tablet before bed caused a 55% drop in melatonin levels and pushed the onset of sleepiness back by about 1.5 hours compared to reading a printed book. A separate study found that just two hours of evening light exposure caused an average 1.1-hour delay in the body’s internal clock.
For children and teenagers, whose circadian systems are still developing, this effect is especially disruptive. A child who needs to fall asleep by 8:30 p.m. but watches a tablet until 8:00 p.m. may not feel genuinely tired until 9:30 or 10:00. Over time, this creates a pattern that looks like insomnia but is really a screen-driven shift in their sleep timing. Moving screens out of the bedroom and switching to non-screen activities in the hour or two before bed can make a noticeable difference within a few nights.
Building a Bedtime Routine That Works
A consistent bedtime routine is one of the best-studied tools for improving children’s sleep. Effective routines tend to draw from four categories: nutrition (a small healthy snack or final feeding), hygiene (a bath, brushing teeth), communication (reading a book together, singing), and physical contact (cuddling, rocking, a back rub). You don’t need all four every night. Pick two or three that fit your family and do them in the same order at roughly the same time.
Consistency matters more than any specific activity. A child’s brain learns to associate the sequence of events with approaching sleep, and that association becomes a powerful cue over time. The routine also serves as a natural transition away from stimulating activities, giving the brain a chance to wind down before lights go out. For toddlers and preschoolers especially, predictability reduces bedtime resistance because they know what comes next.
Signs Your Child Isn’t Getting Enough Sleep
Sleep-deprived children don’t always look sleepy. In fact, they often look the opposite. Younger children who are short on sleep tend to become hyperactive, impulsive, and emotionally volatile rather than drowsy and sluggish. This is why insufficient sleep in children is sometimes mistaken for attention disorders. Other common signs include difficulty waking in the morning, falling asleep in the car on short trips, increased clinginess or meltdowns in the late afternoon, and trouble concentrating at school.
For teenagers, the signs are different. Chronic sleep debt often shows up as persistent irritability, difficulty with schoolwork that used to be manageable, increased anxiety, and sleeping far past their usual wake time on weekends. If your teen is regularly sleeping three or more hours longer on weekends than on school nights, they’re likely carrying significant sleep debt during the week.