How Much Sleep Does My Child Need? Hours by Age, and How to Tell If It's Enough

Most parents ask this question because something is going wrong — early waking, bedtime battles, a child who is exhausted but will not settle. The hours chart is the starting point, but the more useful thing to understand is that the two most common sleep problems look identical from the outside and have opposite fixes.

Quick Takeaways

• The American Academy of Sleep Medicine publishes recommended ranges, endorsed by the AAP
• Ranges are wide because the normal variation between children is genuinely large
• Overtiredness and undertiredness produce similar behaviour and need opposite responses
• Total sleep across 24 hours matters more than any single nap or bedtime

Recommended sleep by age

These are the AASM recommendations, which the American Academy of Pediatrics has formally endorsed. All figures are total sleep per 24 hours, including naps.

Age	Recommended total sleep
4–12 months	12–16 hours
1–2 years	11–14 hours
3–5 years	10–13 hours
6–12 years	9–12 hours

Newborns under 4 months are deliberately excluded. The AASM does not publish a recommendation for this age because normal sleep patterns vary too widely to define a range meaningfully. Newborns commonly sleep somewhere around 16 to 18 hours a day in short, irregular stretches, and that is expected rather than a target.

Note how wide the ranges are. An eighteen-month-old sleeping 11 hours and one sleeping 14 hours are both within normal. If your child sits at one end of the range and is thriving, that is their number.

Typical nap patterns

Naps are the part that changes fastest, and drop transitions are behind a large share of sudden sleep problems.

• 4–8 months: roughly 3 naps, gradually consolidating
• 6–9 months: transition to 2 naps
• 12–18 months: transition to 1 nap — usually the hardest transition, often bumpy for weeks
• 2–4 years: 1 nap, gradually shortening
• 3–5 years: naps drop, with enormous variation. Some children stop at 2½, some nap at 5

A nap transition typically involves several weeks of the old pattern failing and the new one not yet working. It is usually a phase rather than a permanent change, and pushing it too early tends to backfire.

The two problems that look the same

This is the useful part.

Overtired children are wired, not sleepy. They resist bedtime, take a long time to fall asleep, wake frequently, and wake very early. Parents read the resistance as “not tired enough” and push bedtime later, which makes it worse.

Undertired children resist bedtime because they genuinely are not ready. Same resistance, opposite cause.

How to tell them apart:

Signs of overtiredness

• Second wind — a burst of hyperactivity in the late afternoon or evening
• Hard to settle despite obvious tiredness
• Wakes 45–60 minutes after falling asleep
• Very early morning waking (before 6am)
• Short naps that end after one sleep cycle

Signs of undertiredness

• Calm and content at bedtime but simply not sleepy
• Takes a long time to fall asleep without distress
• Sleeps well once asleep, and wakes at a reasonable hour
• The last nap ended late, or was long

Overtired: move bedtime earlier. Counterintuitive and usually correct. Try 20–30 minutes earlier for a week.

Undertired: cap the last nap, or move bedtime later. Also check whether the wake window before bed is long enough.

The reason early waking so often responds to an earlier bedtime is that overtiredness drives lighter, more fragmented sleep in the second half of the night. It feels backwards and it is the single most useful thing to try.

Signs your child is getting enough

More reliable than counting hours:

• Wakes on their own most mornings, without being woken
• Reasonably cheerful within about 20 minutes of waking
• Gets through the afternoon without falling apart
• Falls asleep within about 20 minutes of lights out
• Does not need to catch up dramatically at weekends

That last one is worth watching in school-age children. A child who sleeps two or three hours longer on Saturday is running a deficit during the week.

What actually improves sleep

• A consistent bedtime, including at weekends. Consistency does more than any single technique.
• A short, predictable routine — the same three or four steps, in the same order, taking 20 to 30 minutes.
• A dark room. Light is the strongest input to the body clock, and blackout blinds outperform most other interventions for early waking.
• Screens off well before bed, and out of the bedroom. See our guide to screen time by age.
• A cool room. Around 18–20°C suits most children.
• Daylight in the morning. Outdoor light early in the day anchors the body clock better than anything you do at night.
• Watch the wake window before bed, not just the clock time. Too short and they are not ready; too long and they are overtired.

What to expect during regressions

Sleep does not improve in a straight line. Predictable disruption clusters around 4 months, 8–10 months, 12 months, 18 months, and 2 years — and around any developmental leap, illness, teething, or change in routine.

Most last one to three weeks. The mistake that turns a regression into a lasting problem is introducing a new sleep association during it — a habit that solves a hard fortnight can take months to unpick. See the 2-year-old sleep regression for the one parents ask about most.

When to talk to your paediatrician

• Snoring most nights, or pauses in breathing
• Mouth breathing during sleep
• Persistent difficulty falling or staying asleep despite consistent routines
• Excessive daytime sleepiness in a school-age child
• Sleep that is far outside the recommended range in either direction, with daytime difficulties
• Night terrors or sleepwalking that are frequent or unsafe

Snoring and breathing pauses are worth raising specifically. Sleep-disordered breathing in children is treatable and often presents as behaviour problems rather than obvious tiredness.

Related reading

If you are choosing an approach rather than troubleshooting hours, sleep training methods compared covers the main options. For toddlers whose sleep is disrupted by anxiety at bedtime, separation anxiety in toddlers is the more relevant guide.

This article is general information based on published AASM and AAP guidance and does not replace medical advice. Talk to your paediatrician about your child’s sleep, particularly about snoring or breathing pauses.