Posted by Chris Ailey
on July 22, 2026
Ask ten people how much sleep you are supposed to get and most will say eight hours, with the confidence of someone repeating a rule they have never actually checked. The real answer is more interesting. Sleep need changes across your whole life, it varies between individuals, and the number of hours is only half the story.
Here is what the research actually recommends at every age, why the range matters more than the average, and how to tell whether you personally are getting enough.
Quick answer: Most adults need 7 to 9 hours of sleep a night. Teenagers need 8 to 10, school-age children 9 to 12, and toddlers and babies considerably more. From around 65, the recommended range eases to 7 to 8 hours. These figures come from the National Sleep Foundation's expert consensus and are echoed by the NHS. If you wake refreshed and stay alert through the day without relying on caffeine, you are probably getting enough.
Recommended sleep hours by age
The most widely used reference is the National Sleep Foundation's recommendations, drawn up by a multidisciplinary expert panel and published in the journal Sleep Health. The NHS sleep guidance works to the same broad ranges.
| Age group | Recommended sleep |
|---|---|
| Newborns (0 to 3 months) | 14 to 17 hours |
| Infants (4 to 11 months) | 12 to 15 hours |
| Toddlers (1 to 2 years) | 11 to 14 hours |
| Pre-school (3 to 5 years) | 10 to 13 hours |
| School age (6 to 13 years) | 9 to 11 hours |
| Teenagers (14 to 17 years) | 8 to 10 hours |
| Adults (18 to 64 years) | 7 to 9 hours |
| Older adults (65+) | 7 to 8 hours |
Two things are worth noticing. First, these are ranges, not targets. A healthy adult who feels fully rested on seven hours is not failing at sleep. Second, the floor never drops below seven hours for any adult age group. The widely repeated idea that we need dramatically less sleep as we age is a myth; what changes in later life is the architecture of sleep, not the requirement.
Why the range, and where you sit in it
Sleep need is partly genetic. Within the 7 to 9 hour adult band, some people are true seven-hour sleepers and others genuinely need nine, and no amount of discipline converts one into the other. The honest test is not the clock but the day that follows. The CDC's guidance on sleep frames it simply: enough sleep is the amount that lets you wake feeling rested and function alertly through the day.
Signs you are under-sleeping are unglamorously familiar: needing an alarm and several snoozes to surface, feeling foggy until the second coffee, drifting during quiet afternoon tasks, and sleeping dramatically longer whenever you are free to. One rough self-check: if you routinely sleep two hours longer on holiday than on work nights, your weekday number is probably too low.
Occasional short nights are normal and recoverable. The concern is chronic shortfall. Regularly sleeping less than seven hours is associated in large studies with poorer concentration and mood in the short term, and higher long-term risks around weight, type 2 diabetes, heart disease and low mood.
Hours are only half the story: quality and sleep stages
Two people can both log eight hours and wake feeling completely different, because sleep is not one uniform state. Each night you cycle through light sleep, deep slow-wave sleep and REM sleep, roughly every 90 minutes. Deep sleep does the physical restoration and is concentrated in the first half of the night; REM supports memory and emotional processing and dominates the final hours before waking.
This is why a fragmented eight hours can leave you groggier than a solid seven, and why cutting the last hour of a night disproportionately costs you REM. We cover the full picture, including how much deep sleep you actually need, in our guide to sleep stages and deep sleep.
Continuity matters as much as duration. If you are getting the hours but waking through the night, that is the thread to pull first; our piece on why you wake up at 3am explains the most common causes, from cortisol timing to bedroom temperature.
How sleep changes as you age
Children do not just sleep longer; they spend far more of the night in deep sleep, which is when growth hormone is released. Teenagers need more sleep than adults while their body clocks drift later, which is why a 15-year-old who cannot fall asleep before midnight is showing biology rather than defiance.
Through adulthood, deep sleep gradually declines and sleep becomes lighter and more easily interrupted. By later life, many people find they wake earlier, wake more often, and doze more readily in the day. The requirement barely changes, but achieving it takes more deliberate care: consistent timing, morning daylight, and a bedroom that makes unbroken sleep easy rather than difficult.
Getting the hours you actually need
Most advice about sleeping longer is really advice about consistency. Keeping roughly the same bedtime and wake time, including weekends, anchors your body clock and makes the hours you do get more efficient. A calm, repeatable wind-down tells your brain the day is ending; we have written a practical version in our guide to building a better sleep routine.
The environment carries more weight than people expect. A cool room, somewhere around 16 to 18 degrees, genuinely helps because your core temperature needs to fall for sleep to begin and deep sleep to arrive. Darkness and quiet protect sleep continuity, which protects deep sleep and REM.
And comfort is not a luxury consideration; it is a continuity consideration. A pillow that holds your neck properly and a duvet at the right warmth remove two of the most common reasons people surface at 2am. If your pillow is past its best or your duvet fights your body temperature, that is often the cheapest hour of extra sleep available; our pillows and duvets collection is a calm place to start, and breathable natural fabrics such as washed linen bedding help the bed hold a steady temperature all night.
Frequently asked questions
Is 6 hours of sleep enough?
For almost everyone, no. Expert recommendations put the adult minimum at 7 hours. A small number of people carry rare genetic variants that let them thrive on less, but they are far rarer than the number of people who believe they have adapted to six hours. Chronic short sleep blunts your ability to notice its own effects.
Do older people need less sleep?
Only slightly. The recommended range for over-65s is 7 to 8 hours, barely below the general adult range. What changes with age is that sleep becomes lighter and more fragmented, so it can take longer in bed to achieve the same rested hours.
Can you catch up on sleep at the weekend?
Partially. A lie-in repays some short-term sleep debt and is better than nothing, but research suggests it does not fully reverse the effects of a chronically short week, and very late weekend mornings can shift your body clock and make Monday harder. Consistency beats catch-up.
Is 8 hours of sleep a rule?
No. Eight hours is simply the midpoint of the adult 7 to 9 hour range. Your personal need is set largely by genetics. Judge it by how you feel across the day, not by the single number.
How much deep sleep should I get a night?
Roughly 13 to 23 percent of the night, which for an adult sleeping 8 hours is about 1 to 2 hours of deep sleep. You cannot directly choose to sleep deeper, but protecting total sleep time, keeping the room cool and avoiding late alcohol all increase it. Our deep sleep guide goes into detail.
Quiet upgrades for unbroken sleep
Read more from the sleep-science series in the Bedside Journal, including how much deep sleep you need and why you wake at 3am.
