How Much Sleep Do You Need? Sleep Hours by Age
How many hours should you sleep? See recommended sleep by age from babies to older adults, the signs you're not getting enough, and practical tips for deeper sleep.
Sleep is not wasted time. It is when the body repairs itself, the brain files away memories, and the immune system recharges. But how many hours do we actually need? The answer depends on your age.
Recommended sleep by age
The figures below are based on recommendations from the American Academy of Sleep Medicine and the US National Sleep Foundation, and include naps for young children:
| Age group | Hours of sleep per day |
|---|---|
| Newborns (0–3 months) | 14–17 hours |
| Infants (4–12 months) | 12–16 hours |
| Toddlers (1–2 years) | 11–14 hours |
| Preschoolers (3–5 years) | 10–13 hours |
| School-age children (6–12 years) | 9–12 hours |
| Teenagers (13–18 years) | 8–10 hours |
| Adults (18–64 years) | 7–9 hours |
| Older adults (65+ years) | 7–8 hours |
The golden rule for adults: at least 7 hours on most nights.
Why does sleep matter so much?
While you sleep, your body does jobs it cannot do while you are awake:
- Memory and learning: the brain moves what you learned during the day into long-term memory.
- Immunity: enough sleep helps the body fight infections.
- Hormone balance: including appetite hormones, which is why poor sleep is linked to more hunger and sugar cravings.
- Heart health and mood: chronic short sleep is linked to higher risk of high blood pressure, diabetes, obesity and depression.
Did you know? Each night you pass through four to six sleep cycles of about 90 minutes each, moving between light sleep, deep sleep and dreaming (REM) sleep.
Signs you are not sleeping enough
- You only wake up with an alarm and find it very hard to get up.
- You sleep much longer on days off to catch up.
- You feel drowsy in meetings or while driving.
- You are irritable, forgetful or find it hard to concentrate.
- You rely on coffee or energy drinks to get through the day.
Practical tips for deeper sleep
- Keep a fixed bedtime and wake-up time, even on weekends. Your body loves routine.
- Get daylight in the morning to set your internal clock.
- Cut back on caffeine after midday, since its effects can last for many hours.
- Put screens away 30 to 60 minutes before bed.
- Keep your bedroom dark, quiet and fairly cool.
- Avoid heavy meals right before bed.
- Exercise regularly, but not right before sleeping.
- If you can’t fall asleep within about 20 minutes, get up, do something calm in dim light, then go back to bed.
- Keep naps short (20–30 minutes) and early in the afternoon.
When should you see a doctor?
See a doctor if you have trouble sleeping most nights for several weeks, if others notice you snore loudly and stop breathing during sleep, or if you feel very sleepy during the day despite enough hours in bed. These can be signs of treatable sleep disorders such as sleep apnoea.
Frequently asked questions
Is 6 hours of sleep enough?
For most adults, no. You may feel used to it, but studies show mental performance and health suffer over time. Only a rare few naturally need less.
Can you catch up on sleep at the weekend?
Partly. Extra sleep eases tiredness, but it does not fully undo the effects of repeated short nights during the week. Regularity is best.
Is too much sleep bad for you?
Regularly sleeping more than 9 hours as an adult can be a sign of a health issue or poor-quality sleep, and is worth checking if it continues.
Key takeaway
Most adults need 7 to 9 hours of sleep, and children and teenagers need more. Quality matters as much as quantity: a regular schedule, a dark, quiet room, and less caffeine and screen time make a big difference.
This article is for general education and is not a substitute for advice from a doctor or qualified professional.