How Many Hours Of Sleep Do I Need? An Age-by-Age Guide

It's one of the most common sleep questions: how much sleep do I actually need? The answer depends on your age, your individual needs, and — contrary to popular belief — it's not a simple "8 hours for everyone" rule. The National Sleep Foundation and leading sleep researchers have established clear guidelines based on decades of research, and they might surprise you.

Recommended Sleep by Age: The Official Guidelines

These recommendations come from the National Sleep Foundation's expert panel, which reviewed hundreds of studies. They represent the range where most healthy people in each age group get sufficient sleep:

Age Group	Age Range	Recommended Hours
Newborn	0–3 months	14–17 hours
Infant	4–11 months	12–15 hours
Toddler	1–2 years	11–14 hours
Preschool	3–5 years	10–13 hours
School Age	6–13 years	9–11 hours
Teenager	14–17 years	8–10 hours
Young Adult	18–25 years	7–9 hours
Adult	26–64 years	7–9 hours
Older Adult	65+ years	7–8 hours

Why Sleep Needs Change as We Age

Babies and Children: Building the Brain

The reason babies need so much sleep isn't just that they're small — it's that they're growing. Sleep is when the brain processes and stores new information, forms neural connections, and releases growth hormone. A newborn's brain is developing at an extraordinary rate, and sleep is when most of this critical development happens.

For children aged 6–13, sleep is essential for learning, emotional regulation, and physical growth. Studies consistently show that children who sleep within the recommended range perform better academically, have fewer behavioural problems, and are less prone to illness.

Teenagers: The Sleep-Deprived Epidemic

Teenagers need 8–10 hours of sleep, but most UK teenagers get significantly less. This isn't just about staying up late — there's a biological reason. During puberty, the circadian rhythm shifts later by 1–2 hours, meaning teenagers genuinely feel tired later and want to sleep later. Early school start times work against this biology.

The consequences of chronic sleep deprivation in teenagers are well-documented: impaired concentration, increased risk of anxiety and depression, poorer academic performance, and higher risk of accidents. If your teenager seems to always be tired, it might not be laziness — it might be a genuine biological need that's not being met.

Adults: The 7–9 Hour Window

For most adults, 7–9 hours is the target. But here's an important nuance: individual variation exists. Some people genuinely function well on 7 hours; others need closer to 9. The key is finding your number — the amount of sleep where you wake up feeling refreshed without an alarm and maintain good energy throughout the day.

A large-scale 2010 study of over 1.1 million people found that the lowest mortality and best self-reported health were in the 7–8 hour range. Sleeping less than 6 hours or more than 9 hours was associated with poorer outcomes, though the reasons for oversleeping are complex and often relate to underlying health conditions rather than the sleep itself.

Older Adults: Changes in Sleep Architecture

As we age, several things change in our sleep patterns. We spend less time in deep sleep (stages 3–4), our sleep becomes more fragmented, and we tend to wake earlier. This is normal — not a disorder. Most older adults feel fine on 7–8 hours, even though the quality of that sleep has shifted.

However, consistently sleeping less than 6 hours after age 65 is associated with increased risk of cognitive decline. If you're consistently struggling to get 7 hours, it's worth discussing with your GP to rule out conditions like sleep apnoea, which becomes more common with age.

What Happens When You Don't Get Enough Sleep

Disclosure: SleepReview is reader-supported. When you buy through links on our site, we may earn an affiliate commission. This comes at no extra cost to you and helps us keep providing free, independent advice. We never accept paid placements or sponsored reviews. Read our full affiliate disclosure.