How Much Sleep Do Adults Really Need?

For most adults, the answer is at least seven hours a night, most nights of the week. That number comes from a careful review by the nation's leading sleep scientists, and it is a good starting point. But the number on the clock is only part of the picture. How well you sleep, how regular your schedule is, and how you feel during the day matter just as much.

What the sleep organizations recommend

In 2015, the American Academy of Sleep Medicine (AASM) and the Sleep Research Society brought together a panel of experts to review the research on sleep and health. Their joint recommendation is simple: adults aged 18 to 60 should sleep 7 or more hours per night on a regular basis to support good health.

The Centers for Disease Control and Prevention (CDC) uses similar figures and adds guidance for older adults:

Notice the words "on a regular basis." One short night now and then is part of life. The concern is a pattern of short nights, week after week.

Why seven hours is the line

Sleep is not idle time. During the night your brain and body move through several cycles of lighter sleep, deep sleep, and REM sleep, and each stage does its own work. You can read more about that in our guide to the stages of the sleep cycle.

When researchers compared people who usually slept less than seven hours with those who slept seven or more, the short sleepers had higher rates of a range of health problems. The National Heart, Lung, and Blood Institute (NHLBI) notes that adults who sleep less than seven hours a night may face more health problems than those who sleep at least seven.

Short sleep also affects everyday life in ways that are easy to overlook: slower reactions, shorter patience, and more mistakes at work or on the road.

Quality and timing matter, too

Eight hours in bed is not the same as eight hours of sleep. If you wake many times during the night, lie awake for long stretches, or snore heavily with pauses in breathing, you may spend enough time in bed and still wake up tired.

Three things are worth paying attention to along with total hours:

• Continuity. Do you sleep mostly in one stretch, or is the night broken into pieces?
• Regularity. Do you go to bed and get up at roughly the same times, including weekends? A steady wake time is one of the most useful habits you can build. Our guide to keeping a consistent sleep schedule explains why.
• How you feel. Do you wake reasonably refreshed and stay alert through the day without leaning heavily on caffeine?

Signs you may not be getting enough

Many people who are short on sleep don't notice it, because feeling a little tired becomes normal. The NHLBI lists several signs of sleep deficiency in adults:

• Trouble concentrating, learning, or reacting quickly
• Feeling irritable, frustrated, or anxious, especially around other people
• Difficulty reading other people's emotions
• Problems functioning at work, at home, or while driving
• Falling asleep during the day without meaning to, such as while reading, watching TV, or sitting in traffic

If you regularly doze off when you sit still, that is a meaningful signal. Unplanned sleepiness while driving is never something to push through. Pull over somewhere safe.

Sleep as we get older

It is a common belief that older adults simply need less sleep. The research does not support that. Recommended amounts change only a little after age 60.

What does change is the shape of sleep. Many older adults find that sleep becomes lighter, they wake more often during the night, and they get sleepy earlier in the evening and wake earlier in the morning. Health conditions, pain, medicines, and nighttime bathroom trips can all add to that.

Lighter sleep with age is normal. Feeling exhausted every day, or lying awake for long periods most nights, is not something you just have to accept. Those are worth discussing with a clinician.

A brief word about teenagers

Teens need more sleep than adults. The AASM recommends 8 to 10 hours in each 24-hour period for teens aged 13 to 18. During adolescence, the body clock also shifts later, so many teens genuinely don't feel sleepy until late at night. Early school start times, homework, jobs, and phones in the bedroom make it hard to get enough. Parents can help by protecting a regular wake time and keeping screens out of the bedroom at night.

Finding the right amount for you

A practical way to learn your own sleep need is to watch your patterns for a week or two:

1. Keep a simple sleep diary. Note when you got into bed, roughly when you fell asleep, when you woke up, and how rested you felt. Estimates are fine.
2. Hold your wake time steady. Pick a wake-up time you can keep every day, then adjust bedtime rather than sleeping in.
3. Look for the pattern. On which nights did you feel best the next day? How many hours of sleep came before those days?
4. Adjust gradually. If you are short on sleep, move bedtime earlier by 15 minutes at a time rather than all at once.

If you consistently allow seven to nine hours and still wake up unrefreshed, the problem may not be the amount of sleep at all. Conditions such as sleep apnea or insomnia can disrupt sleep in ways you may not notice. Our guide on when to see a doctor about sleep can help you decide on a next step.

Last reviewed and updated October 17, 2026. This article is for general education and isn't a substitute for advice from your own clinician. Read our medical disclaimer and editorial standards.