How Much Sleep Do Adults Really Need? Hours by Age, Signs You're Short and How to Sleep Better

Seven hours. That's the short answer for most adults, and it's the one sleep scientists landed on after looking at a mountain of research. But the full answer is a lot more interesting, and a lot more useful, than a single number. How much sleep you need shifts with age, health and how well you're actually sleeping once your head hits the pillow.

So let's dig in: how much sleep you really need, how to tell if you're running short, what your sleep tracker is and isn't telling you, and the habits that make a full night so much easier to get.

How much sleep do adults need? The official recommendation

In 2015, the American Academy of Sleep Medicine and the Sleep Research Society brought together a panel of experts to review the evidence. Their conclusion: adults aged 18 to 60 should sleep 7 or more hours a night on a regular basis for the best health.

Look closely at that wording, because it matters. Seven isn't the target you squeak past on a good night. It's the floor. Regularly sleeping less than that was linked with weight gain, obesity, diabetes, high blood pressure, heart disease, stroke, depression, a weaker immune system, more pain, poorer performance and more accidents.

How much sleep do you need by age?

Sleep needs change across your life. Here are the ranges recommended by the CDC, based on guidance from the American Academy of Sleep Medicine and the National Sleep Foundation:

• Newborns (0 to 3 months): 14 to 17 hours, including naps
• 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 or more hours
• Adults (61 to 64 years): 7 to 9 hours
• Adults (65 and older): 7 to 8 hours

Older adults often find their sleep gets lighter and more broken, and they tend to wake earlier. That's common, but persistent tiredness isn't just "getting older." It's worth raising with a doctor.

Is 6 hours of sleep enough?

For the vast majority of people, no. You may feel used to it, and that's part of the trap. In a well-known 2003 study from the University of Pennsylvania, people limited to 6 hours a night for two weeks showed thinking and reaction-time problems similar to people who'd stayed awake for a full night or two. Yet they rated themselves as only slightly sleepy. Sleep loss fogs your ability to notice how impaired you are.

A very small number of people carry rare gene variants that let them thrive on less sleep. If you need an alarm and three coffees to function, you're almost certainly not one of them.

What enough sleep really means

The hours are only part of the picture. A few things the number doesn't tell you:

• Some people need more. Young adults, people recovering from illness, pregnant people and anyone paying back a sleep debt may need 9 hours or more.
• Time in bed isn't time asleep. If you're in bed for 7 hours but take 40 minutes to drift off and wake up for half an hour at 3 a.m., you're short.
• Quality counts too. Waking up over and over, or loud snoring with pauses in breathing, can leave you exhausted even after 8 hours. Those are worth raising with a doctor, because sleep apnea is common and very treatable.
• Regularity matters. Research increasingly suggests that going to bed and waking at consistent times is linked to better health, even separately from total hours.

Signs you're not getting enough sleep

You don't need a gadget to know. Ask yourself:

• Do you need an alarm every single day, and hit snooze more than once?
• Do you fall asleep within minutes of sitting still, like on the couch, in a meeting or as a passenger in a car?
• Do you sleep two or three hours longer on weekends?
• Are you leaning on caffeine to get through the afternoon?
• Are you more irritable, forgetful or snacky than usual?
• Do you get sick more often?

A yes to a couple of those usually means your body wants more than it's getting.

What happens to your body when you don't sleep enough?

Short-term, sleep loss makes it harder to focus, remember things and control your mood. It nudges up hunger hormones, which is one reason tired days often turn into snacking days. Drowsy driving is a serious risk too.

Long-term, regularly short sleep is linked to higher blood pressure, type 2 diabetes, weight gain, heart disease and depression. Sleep is also when your brain clears out waste products and stores memories, so skimping on it costs you in more ways than feeling groggy.

Sleep trackers: helpful or harmful?

Wearables top the American College of Sports Medicine's fitness trends list for 2026, and lots of people now wake up to a sleep score. They can be genuinely useful for spotting patterns, like how late dinners or evening drinks affect your nights.

Keep a few things in mind though:

• Consumer trackers estimate sleep from movement and heart rate. They're decent at total sleep time but much less accurate at telling sleep stages apart.
• Obsessing over a perfect score can backfire. Sleep researchers have a name for it, orthosomnia, where anxiety about sleep data makes sleep worse.
• How you feel during the day is still the best measure. If you feel rested and the tracker says you slept badly, trust your body.

How to get better sleep: habits that make 7 hours easier

Keep the same wake-up time every day

This one does more than almost anything else. Getting up at the same time every day, weekends included, sets your body clock. Bedtime tends to fall into place after that.

Get bright light in the morning and dim light at night

Daylight soon after you wake helps anchor your rhythm. Even 10 minutes outside makes a difference, cloudy days included. In the evening, lower the lights and give screens a rest for the last half hour, or at least turn the brightness down.

Set a caffeine cutoff

Caffeine lingers for hours. A 3 p.m. latte can still be working when you turn the light off. We cover the research in caffeine and sleep.

Be careful with alcohol

A nightcap may help you nod off, but alcohol breaks up your sleep in the second half of the night and suppresses REM sleep. You often wake up less rested.

Make the bedroom cool, dark and boring

Most people sleep best in a cool room. Blackout curtains or an eye mask, earplugs or a fan for steady background noise can all help. Keep work, the TV and the phone somewhere else if you can. Your brain learns that bed means sleep.

Move your body during the day

Regular activity helps people fall asleep faster and sleep more deeply. Just try to finish hard workouts at least a couple of hours before bed if they leave you wired. Our guide to 150 minutes of exercise a week shows how to fit it in.

Wind down with a routine

A predictable 20 to 30 minutes before bed tells your brain the day is over: a shower, reading a paper book, gentle stretching or box breathing. Keep it boring on purpose.

Don't fight it for hours

If you've been lying awake for what feels like 20 minutes, get up. Do something calm in dim light until you feel sleepy, then go back. Lying there frustrated teaches your brain that bed is a place for worrying.

Are naps good or bad?

A short nap of 10 to 20 minutes in the early afternoon can boost alertness without leaving you groggy. Longer or later naps can make it harder to fall asleep at night. If you're napping every day because you're exhausted, look at your night-time sleep first.

When poor sleep needs a doctor

Long-term trouble falling or staying asleep is very common, and it's treatable. The first-choice treatment for chronic insomnia is cognitive behavioral therapy for insomnia (CBT-I), a short program often done over a handful of sessions or through an app. It tends to work better over the long run than sleeping pills.

Talk to your doctor if:

• Poor sleep has lasted more than a few weeks
• Someone tells you that you stop breathing, gasp or snore loudly in your sleep
• You feel an urge to move your legs at night
• You're very sleepy during the day despite enough time in bed
• Low mood or anxiety is keeping you awake

Frequently asked questions about sleep

Can you catch up on sleep at the weekend?

Partly. Sleeping in can ease some short-term sleep debt, but it doesn't fully undo a week of short nights, and big weekend lie-ins can throw off your body clock for Monday.

Is 8 hours of sleep better than 7?

For many adults, 7 to 9 hours is the sweet spot. Some people feel best at 7, others need closer to 9. Pay attention to how you feel on days you get more.

Why do I wake up at 3 a.m.?

Brief wake-ups are normal between sleep cycles. If you're fully waking and struggling to get back to sleep, common culprits include stress, alcohol, a warm room, needing the bathroom or sleep apnea.

Is it bad to sleep too much?

Regularly sleeping much more than 9 hours is linked with health problems, though often because an underlying illness causes both. If you suddenly need far more sleep than usual, see a doctor.

Curious how your sleep fits with the rest of your life? The free wellness wheel quiz checks all eight dimensions of wellness in about two minutes.