“How much sleep do I actually need?” is one of the most common questions I hear in clinic. Most people expect a single number. The honest answer is that it depends on your age, and the target moves a lot from infancy to adulthood.

Here is the short version. Most adults need at least 7 hours a night. Teens need 8 to 10. School-age kids need 9 to 12. Toddlers and preschoolers need even more, naps included.

Below, I walk you through each age group, what the American Academy of Sleep Medicine (AASM) recommends, and what the newest research tells us about why those numbers matter.

Why Sleep Hours Matter

Sleep is not downtime. It is when your body does its repair work. Your brain clears out waste, stores memories, and resets your mood. Your body releases growth hormone, balances appetite hormones, and recovers from the day.

When you cut sleep short, you build up sleep debt. Like any debt, it adds up. One short night makes you foggy. Weeks of short nights start to take a toll on your weight, mood, memory, and long-term health.

Where These Numbers Come From

The AASM recommendations come from two expert panels that reviewed thousands of studies on sleep and health. The adult statement was published in 2015 with the Sleep Research Society. The pediatric statement followed in 2016 and was endorsed by the American Academy of Pediatrics.

These statements are older than five years. I include them because they remain the official AASM guidance in the United States, and no newer AASM version has replaced them. Every other study in this article was published in the last five years.

Quick Reference: AASM Sleep Recommendations by Age

Age group	Recommended sleep per 24 hours
Newborns (0 to 3 months)	No set range. Sleep varies widely at this age
Infants (4 to 12 months)	12 to 16 hours, including naps
Toddlers (1 to 2 years)	11 to 14 hours, including naps
Preschoolers (3 to 5 years)	10 to 13 hours, including naps
School-age children (6 to 12 years)	9 to 12 hours
Teens (13 to 18 years)	8 to 10 hours
Adults (18 to 60 years)	7 to 9 hours
Adults over 60	No separate AASM range. Recent research supports about 7 hours

Newborns (0 to 3 Months)

The AASM does not set a target for babies under 4 months. Newborn sleep is spread across the day and night in short stretches, and healthy babies vary widely.

What to focus on:

• Follow safe sleep practices. Place your baby on their back, on a firm, flat surface, with no loose bedding.
• Expect irregular patterns. A day-night rhythm usually starts forming after the first couple of months.
• Talk to your pediatrician if your baby seems unusually hard to wake or is not feeding well.

Infants (4 to 12 Months): 12 to 16 Hours

By this age, most babies start sleeping longer at night and settle into a few predictable naps. The 12 to 16 hours includes those naps.

What helps:

• Keep a simple, repeatable bedtime routine. Bath, feed, book, bed works well for many families.
• Put your baby down drowsy but awake when you can. This helps them learn to fall back asleep on their own.
• Keep nights dark and quiet, and days bright and active.

Toddlers (1 to 2 Years): 11 to 14 Hours

Most toddlers still need one or two naps. Many parents drop naps too early because bedtime turns into a battle. Often the problem is the opposite. An overtired toddler fights sleep harder.

What helps:

• Keep bedtime and wake time within about 30 minutes, even on weekends.
• Watch for sleepy signs such as rubbing eyes, clinginess, or sudden meltdowns.
• Keep screens out of the bedtime routine.

Preschoolers (3 to 5 Years): 10 to 13 Hours

Many kids drop their nap somewhere in this window. If your child gives up the nap, move bedtime earlier to make up the difference.

What helps:

• Aim for a consistent lights-out time that allows at least 10 hours before wake-up.
• Use a calm wind-down routine of 20 to 30 minutes.
• If your child snores most nights, breathes through the mouth, or seems restless in sleep, have them evaluated for a sleep breathing disorder. Enlarged tonsils and adenoids are a common cause at this age.

The research for very young children relies mostly on observational studies and expert consensus. That is why I lean heavily on the AASM ranges for these ages.

School-Age Children (6 to 12 Years): 9 to 12 Hours

This is where newer research gets very clear.

A large 2022 study in The Lancet Child and Adolescent Health followed more than 8,300 children aged 9 and 10 from the national ABCD brain development study. Kids who slept less than 9 hours had more mental health and behavior problems. They also scored lower on memory, learning, and decision-making tasks. Brain scans showed less gray matter in areas that control attention, memory, and impulse control. Those differences were still there two years later.

This was an observational study, so it shows a strong link, not proof of cause. Still, it fits closely with the AASM cutoff of 9 hours.

What helps:

• Work backward from wake time. If your child wakes at 6:30 a.m., lights-out should be by about 9:30 p.m. at the latest.
• Keep phones, tablets, and gaming out of the bedroom at night.
• Watch for signs of short sleep. These include trouble waking up, irritability after school, poor focus, and falling asleep in the car.

Teens (13 to 18 Years): 8 to 10 Hours

Teens have a biological shift in their body clock. Their brain releases melatonin later at night, so they naturally feel sleepy later. Early school start times then cut their sleep short. The result is a generation of chronically tired teenagers.

Short sleep in teens is not only about grades. It affects what they eat.

In a 2022 randomized crossover study published in Sleep, 93 teens spent five nights with only 6.5 hours in bed and five nights with 9.5 hours in bed. When short on sleep, they ate more carbohydrates, more added sugar, and more sugary drinks. They also ate fewer fruits and vegetables. Most of the extra snacking happened after 9 p.m.

Because the teens served as their own comparison group, this design gives stronger evidence of cause and effect than a typical survey study.

What helps:

• Set a phone curfew. The phone charges outside the bedroom, or at least out of arm’s reach, with Do Not Disturb on.
• Get morning light. Ten to fifteen minutes outside after waking helps pull the body clock earlier.
• Limit weekend sleep-ins to about two hours past the weekday wake time. Longer sleep-ins make Monday mornings harder.
• If your teen sleeps 9 or more hours and is still exhausted, they should be evaluated for a sleep disorder such as hypersomnia or a delayed sleep phase.

Adults (18 to 60 Years): 7 Hours or More

The AASM recommends at least 7 hours a night for adults. Sleeping more than 9 hours may be appropriate for young adults, people recovering from illness, and anyone paying back sleep debt.

Can you train yourself to sleep less? You can get used to it. But your body still pays the price. Many people who sleep 5 or 6 hours feel “fine” because they have forgotten what well-rested feels like.

The best recent trial on this topic came out of the University of Chicago. In a 2022 randomized clinical trial in JAMA Internal Medicine, 80 adults with overweight who usually slept less than 6.5 hours received one personalized sleep counseling session. They extended their sleep by about 1.2 hours a night. Over just two weeks, they ate about 270 fewer calories per day compared with the control group, without any diet advice.

That is the strongest type of evidence we have, and it shows that sleep is a real lever for weight control.

Large population studies point in the same direction. A 2025 meta-analysis in GeroScience pooled 79 cohort studies. Compared with 7 to 8 hours, sleeping less than 7 hours was linked to a 14 percent higher risk of death. Sleeping 9 hours or more was linked to a 34 percent higher risk.

A word of caution on the long-sleep finding. These are observational studies. Long sleep is often a sign of an underlying problem such as depression, sleep apnea, or chronic illness, rather than the cause of harm itself.

Signs you are not getting enough sleep:

• Hitting snooze several times every morning
• Needing caffeine to function by mid-morning
• Yawning through afternoon meetings or feeling heavy after lunch
• Skipping evening plans because you are too tired
• Sleeping much longer on weekends than on weekdays

Adults Over 60: Aim for About 7 Hours

The AASM adult statement covered ages 18 to 60 and did not set a separate range for older adults. Sleep naturally becomes lighter and more broken with age, but the need for sleep does not drop much.

A 2022 study in Nature Aging looked at nearly 500,000 adults aged 38 to 73 in the UK Biobank. About 7 hours was the sweet spot for memory, thinking, and mental health. Both shorter and longer sleep were linked to faster cognitive decline over time. Keeping a steady 7 hours, without big swings from night to night, mattered too.

This was observational, so it shows association rather than proof. But it lines up well with the mortality data above.

What helps:

• Keep a fixed wake time, even if your night was rough.
• Get bright light in the morning and stay active during the day.
• Keep naps short, under 30 minutes, and before 3 p.m.
• If you wake up gasping, snore loudly, or feel unrefreshed despite enough time in bed, you should be evaluated for sleep apnea. It becomes more common with age and is very treatable.

Hours Are Only Part of the Picture

Hitting your number matters. So does keeping your schedule steady.

A 2024 study in the journal Sleep tracked the sleep of tens of thousands of UK adults using wrist devices. People with the most irregular sleep schedules had a higher risk of death, and sleep regularity predicted that risk better than sleep duration did.

In plain terms, going to bed and waking up at the same time each day may matter as much as how long you sleep. This was an observational study, but it is one of the largest of its kind to use objective sleep tracking.

How to Find Your Own Number

The ranges above are starting points. Your personal need sits somewhere inside them. Here is a simple way to find it:

• Pick a wake time you can keep every day.
• Count back 7.5 to 8 hours and set that as your bedtime. Adjust for your age group.
• Keep it steady for two weeks.
• If you wake without an alarm and stay alert until evening, you have found your number.
• If you are still tired, move bedtime 15 minutes earlier each week until you feel rested.

When to See a Sleep Doctor

Getting enough hours and still feeling exhausted is a red flag. So is being unable to get the hours no matter how hard you try. Talk to a sleep specialist if you notice:

• Loud snoring, gasping, or pauses in breathing during sleep. You should be evaluated for a sleep breathing disorder such as sleep apnea.
• Trouble falling or staying asleep at least three nights a week for three months. You should be evaluated for insomnia.
• Sleeping 9 or more hours and still struggling to stay awake during the day. You should be evaluated for hypersomnia.
• Restless legs, acting out dreams, or unusual behaviors at night. These may point to a sleep quality issue worth checking.

The Bottom Line

• Adults need at least 7 hours. About 7 to 8 hours appears to be the healthiest range for most people.
• Teens need 8 to 10 hours, and short sleep changes what they eat.
• School-age kids need 9 to 12 hours. Under 9 hours is linked to changes in brain development.
• Toddlers and preschoolers need 10 to 14 hours, naps included.
• A consistent schedule matters almost as much as total hours.
• If you sleep enough and still feel tired, get checked.

The good news is that sleep is one of the most fixable parts of your health. Small, steady changes to your schedule can pay off within weeks. And if something more is going on, there are effective, personalized treatments for nearly every sleep disorder. I genuinely enjoy helping my patients get there.

---

This article is for educational purposes only and does not replace medical advice. Talk with your doctor or a board-certified sleep specialist about your own sleep, especially if you have symptoms of a sleep disorder or an existing health condition.

References

1. Watson NF, Badr MS, Belenky G, et al. Recommended amount of sleep for a healthy adult: a joint consensus statement of the American Academy of Sleep Medicine and Sleep Research Society. J Clin Sleep Med. 2015;11(6):591-592. (Official AASM guidance, included as the current standard.)
2. Paruthi S, Brooks LJ, D’Ambrosio C, et al. Recommended amount of sleep for pediatric populations: a consensus statement of the American Academy of Sleep Medicine. J Clin Sleep Med. 2016;12(6):785-786. (Official AASM guidance, included as the current standard.)
3. Tasali E, Wroblewski K, Kahn E, Kilkus J, Schoeller DA. Effect of sleep extension on objectively assessed energy intake among adults with overweight in real-life settings: a randomized clinical trial. JAMA Intern Med. 2022;182(4):365-374. (Randomized clinical trial.)
4. Duraccio KM, Whitacre C, Krietsch KN, et al. Losing sleep by staying up late leads adolescents to consume more carbohydrates and a higher glycemic load. Sleep. 2022;45(3):zsab269. (Randomized crossover experimental study.)
5. Ungvari Z, Fekete M, Varga P, et al. Imbalanced sleep increases mortality risk by 14-34%: a meta-analysis. GeroScience. 2025;47(3):4545-4566. (Meta-analysis of 79 cohort studies.)
6. Yang FN, Xie W, Wang Z. Effects of sleep duration on neurocognitive development in early adolescents in the USA: a propensity score matched, longitudinal, observational study. Lancet Child Adolesc Health. 2022;6(10):705-712. (Large longitudinal observational study.)
7. Li Y, Sahakian BJ, Kang J, et al. The brain structure and genetic mechanisms underlying the nonlinear association between sleep duration, cognition and mental health. Nat Aging. 2022;2(5):425-437. (Large observational cohort study.)
8. Windred DP, Burns AC, Lane JM, et al. Sleep regularity is a stronger predictor of mortality risk than sleep duration: a prospective cohort study. Sleep. 2024;47(1):zsad253. (Large prospective cohort study.)