How Much Sleep Do You Need? (By Age Chart)
The quick chart
These ranges come from the National Sleep Foundation and the American Academy of Sleep Medicine:
| Age | Recommended per night |
|---|---|
| Newborns (0–3 months) | 14–17 hours |
| Infants (4–11 months) | 12–15 hours |
| Toddlers (1–2 years) | 11–14 hours |
| Preschoolers (3–5) | 10–13 hours |
| School children (6–13) | 9–11 hours |
| Teenagers (14–17) | 8–10 hours |
| Adults (18–64) | 7–9 hours |
| Older adults (65+) | 7–8 hours |
Why it is a range, not one number
Sleep need varies with genetics, activity, health, and age. The honest way to find yours: for one week, go to bed when sleepy, wake without an alarm, and average it. Most adults land between 7 and 9 hours — consistently under 7 is where problems start.
Signs you are not getting enough
- Needing an alarm — and snoozing it repeatedly
- Afternoon energy crashes that coffee barely fixes
- Falling asleep within minutes of sitting still (a red flag, not a skill)
- Trouble concentrating, short temper, sugar cravings
- Getting sick more often than usual
Three or more of these for weeks means you are likely carrying sleep debt — calculate it and make a payback plan.
Does sleep need change with age?
Yes. Teenagers need 8–10 hours partly because their body clock shifts later — early school starts fight biology, which is why teens are famously groggy. After 65, total need drops slightly to 7–8 hours, but sleep gets lighter and more broken; daytime naps become more useful (see our nap calculator).
Can you sleep too much?
Regularly sleeping 10+ hours as an adult and still feeling tired is worth discussing with a doctor — it can signal sleep apnea, depression, or other conditions. Long sleep itself is rarely the problem; unrefreshing sleep is.
How to actually get your number
- Fix your wake time first — the same time 7 days a week. Then let bedtime float until you wake naturally a few minutes before the alarm.
- Count cycles, not just hours: aim for 5–6 full 90-minute cycles. Our sleep calculator does the math from any wake-up time.
- Give it 2 weeks. One good night does not erase months of debt.
Do natural short sleepers exist?
A tiny fraction of people genuinely thrive on 6 hours — linked to rare gene variants such as DEC2. They are the exception, estimated at well under 1% of people. The catch: far larger numbers believe they are short sleepers while their reaction time and judgment quietly decline. Unless you wake naturally after 6 hours feeling fully alert, and have done so for years, assume you are not one.
Exercise, diet, and your number
Heavy training days push your need toward the top of your range — athletes in intense blocks often need 9–10 hours. Alcohol is the great pretender: it makes you fall asleep faster but fragments the second half of the night, so 8 hours after drinking counts for less than 8 clean hours. Large late meals can delay sleep onset too; finish eating 2–3 hours before bed when you can. None of this changes your baseline much — it just moves you within your range.
FAQs
Is 6 hours of sleep enough for an adult? It is 4 full cycles — survivable short-term, but below the 7–9 hour recommendation. Most people accumulate debt at 6 hours.
Do I need less sleep as I get older? Slightly — 7–8 hours after 65 versus 7–9 for younger adults.
How do I know my exact sleep need? A week of ad-lib sleep (bed when sleepy, no alarm) reveals it. Your average is your number.
This article is for general information only and is not medical advice. Talk to a healthcare professional about ongoing sleep problems.