How Much Sleep Does Your Child Really Need? An Age-by-Age Guide

An age-by-age sleep guide, the signs your child isn't getting enough, and the small routine changes that fix most bedtime battles within a week.

Almost every behaviour problem parents bring up, the meltdowns, the homework wars, the morning grumpiness, the inexplicable five o'clock storm, has sleep somewhere underneath it. Not always the whole answer, but more often than we expect. A tired child is not a difficult child, they are a child running on too little fuel.

The trouble is that sleep needs change a lot, year by year, and the schedule that worked at four can be entirely wrong by seven. Here is what the research actually shows, and what works in real homes.

How much sleep, by age

These ranges come from the American Academy of Sleep Medicine and are the ones most paediatricians use. Total sleep includes naps for younger children.

Most parents underestimate the upper end of these ranges. A six-year-old getting nine hours a night is at the bare minimum, not the comfortable middle. If your child is at the low end and waking tired, they are short on sleep, even if the number sounds reasonable.

Working backwards from wake-up

The simplest way to set bedtime is to work backwards. If your seven-year-old has to be up at 6:45 for school and needs ten hours of sleep, lights out is 8:45 — which means starting the wind-down at 8:00. Most of us underestimate how much earlier this needs to be.

A useful rule of thumb: start the bedtime routine forty-five minutes before lights-out. The brain doesn't switch off, it has to be helped down.

Signs your child isn't getting enough sleep

• Difficulty waking in the morning, even with a full night in bed
• Hyperactivity in the late afternoon, this is often misread as energy when it is exhaustion
• Big emotional swings, especially after school
• Trouble focusing on schoolwork they used to handle easily
• Frequent illness, sleep is when the immune system does most of its work
• A second wind around 9 or 10pm, almost always a sign of overtired-not-tired

If three or more of these are showing up, your child likely needs an earlier bedtime, a calmer wind-down, or both.

The wind-down that actually works

The hour before bed is doing most of the work. A child who is jumping around at 8:50 is not going to sleep at 9:00, no matter what time the lights go off. Build a predictable rhythm:

90 minutes before bed Last meal or snack, light and not sugary. Final loud play.

60 minutes before bed Screens off, all of them. Bath, pyjamas, slow indoor light.

30 minutes before bed In the bedroom, low light, books, quiet conversation, a cuddle.

10 minutes before bed Lights out, perhaps a song, perhaps silence. The same words and the same order, every night.

Predictability is the active ingredient. Children's brains rely on cues, the same routine signals to the body that sleep is approaching, and melatonin starts releasing before the lights even go off.

A bedtime routine isn't about discipline, it is a runway. Without it, every night is a fresh negotiation, and negotiations don't help anyone fall asleep.

The quiet sleep killers in most homes

• Screens in the hour before bed. Blue light suppresses melatonin, and the dopamine of short-form content keeps the brain looking for more. The single biggest fix in most households is moving phones and tablets out of the bedroom altogether.
• Late dinners. A heavy meal too close to bed makes deep sleep harder.
• Bedrooms that aren't dark or cool enough. A child sleeps better in a cool, dark, quiet room. Blackout curtains and a fan are not luxuries, they are tools.
• Inconsistent bedtimes on weekends. An hour later on Saturday, an hour later on Sunday, and Monday morning is wrecked. Try to stay within thirty minutes of the weekday bedtime.
• Hidden caffeine. Iced tea, chocolate, cola, even some "kid-friendly" energy drinks. Most pediatricians recommend zero caffeine before age 12.

What to do when bedtime falls apart

If bedtime has become a nightly battle, don't try to fix everything at once. Pick one change and hold it for ten days. The most reliable single change is moving the routine fifteen minutes earlier and adding a screen-free wind-down. That one shift, kept consistent, fixes most cases on its own.

If your child wakes often in the night, takes longer than thirty minutes to fall asleep most nights, or seems exhausted despite enough hours, talk to your paediatrician. Sleep apnoea, restless legs, and other treatable conditions are more common in children than parents tend to realise.

Naps: when to keep them, when to drop them

Most children stop napping somewhere between three and five. Signs the nap is on its way out: bedtime keeps getting later because they are not tired, the nap fights are louder than the nap is restful, or the day works fine without one. Replace it with a quiet hour, books, drawing, soft music, not a substitute, but a bridge.

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