2–16 YearsHealth & Safety
How Much Sleep Do Kids Need by Age?
Sleep is the single variable that changes most about the following day. The ranges by age, the signs a child is short, and why bedtime is the wrong lever.
Sleep is the single variable that changes most about the following day, and it is the one most often traded away. Here are the ranges, and then the part that matters more than the ranges.
| Age | Total in 24 hours | Notes |
|---|---|---|
| 1 to 2 | 11 to 14 hours | Including one nap for most |
| 3 to 5 | 10 to 13 hours | Naps usually stop somewhere in here |
| 6 to 12 | 9 to 12 hours | The range narrows in practice; most need the upper half |
| 13 to 18 | 8 to 10 hours | Body clock shifts later. This is biology, not laziness |
Short sleep does not look like tiredness
This is the part worth knowing. An adult who is short of sleep looks sleepy. A child who is short of sleep looks fidgety, silly, irritable and unable to settle. It reads as behaviour, so it gets treated as behaviour, and the actual cause goes unexamined for months.
Before treating a concentration or behaviour problem as what it appears to be, count the hours honestly for a week. Not what time they went up: what time they actually fell asleep, and what time they woke.
What matters as much as the total
Consistency. A regular sleep and wake time, including weekends within an hour or so, matters nearly as much as duration. Wildly different weekend timings produce a Monday that is genuinely harder for physiological reasons.
The hour before. Screens, bright light and anything exciting delay sleep onset. The mechanism is more about arousal and displaced hours than blue light alone, which is why a calm boring hour beats a filter.
Where the device sleeps. No screens in bedrooms overnight is the most evidence-supported rule in this whole area and the one most worth holding.
Teenagers
Adolescent body clocks genuinely shift later at puberty. A fourteen-year-old who cannot fall asleep at ten is not being difficult; their melatonin is arriving later than yours. Combined with early school starts this produces a chronic shortfall that they then try to repay at weekends, which shifts the clock further.
The practical levers are morning light, a consistent wake time, and getting the phone out of the room. Arguing about bedtime is the least effective of the available options.
When to ask
Loud snoring, pauses in breathing, or mouth breathing every night are worth mentioning to a doctor rather than treated as a sleep habit. So is a child who is getting adequate hours and is still exhausted.
This piece is general guidance and is not a substitute for advice from a doctor who knows your child.