The average hours of sleep per night for adults is roughly 7 to 9 hours, with most national surveys reporting a mean of about 7.1 to 7.4 hours on workdays and slightly more on weekends. However, this figure varies significantly by age, lifestyle, and geography, so it is best understood as a range rather than a single universal number.
What the Major Sleep Guidelines Say
The most widely cited recommendations come from the National Sleep Foundation and the American Academy of Sleep Medicine, both of which convened expert panels to review hundreds of studies. Their consensus for healthy adults aged 18–64 is 7 to 9 hours per night, with 6 hours considered “possibly appropriate” for some individuals and 10 hours the upper limit for others. For teenagers (14–17), the recommended range is 8 to 10 hours, while school-aged children (6–13) need 9 to 11 hours. Adults over 65 are advised to get 7 to 8 hours, though many older adults naturally sleep less due to changes in sleep architecture.
How Sleep Duration Is Measured in Surveys
National surveys such as the U.S. Centers for Disease Control and Prevention’s Behavioral Risk Factor Surveillance System (BRFSS) and the National Health Interview Survey ask participants to report their typical sleep duration. These self-reports often overestimate actual sleep by 30–60 minutes compared with objective measures like actigraphy (wrist-worn movement sensors) or polysomnography (lab-based sleep studies). For example, a person might say they slept 8 hours but actually slept 7.2 hours when measured. This discrepancy matters because many studies linking short sleep to health outcomes rely on self-reported data.
Age and Life Stage Differences
Sleep needs change dramatically across the lifespan. Newborns (0–3 months) sleep 14 to 17 hours per day, often in short bursts. Infants (4–11 months) need 12 to 15 hours, toddlers (1–2 years) 11 to 14 hours, and preschoolers (3–5 years) 10 to 13 hours. School-age children require 9 to 11 hours, and adolescents need 8 to 10 hours, though many get far less due to early school start times and social pressures. In adulthood, the average remains stable until around age 60, after which total sleep time and deep sleep (slow-wave sleep) decline. Older adults often wake more frequently at night, so they may spend more time in bed but get less consolidated sleep.
Global and Regional Variations
Cross-national studies using self-reports and wearable devices show notable differences. For instance, a large 2016 study using a smartphone app (Sleep Cycle) found that people in Japan and South Korea averaged around 6.5 hours per night, while those in Finland and the Netherlands averaged over 7.5 hours. These differences correlate with cultural norms around napping, work hours, and evening screen use. However, such app-based data are not nationally representative—users tend to be younger and more health-conscious. Official statistics from the OECD show that countries like France, Spain, and the United States have average sleep durations around 7 hours, while Japan and South Korea are closer to 6.5 to 7 hours.
Short Sleep and Long Sleep: Health Implications
Consistently sleeping fewer than 7 hours is associated with increased risks of obesity, type 2 diabetes, hypertension, cardiovascular disease, and impaired cognitive function. A well-known 2003 study by Van Cauter and colleagues showed that sleep restriction to 4–5 hours per night for a week reduced glucose tolerance and increased cortisol levels. Conversely, sleeping more than 9 hours regularly (long sleep) is also linked to higher mortality and morbidity, though it is unclear whether long sleep causes health problems or is a marker of underlying illness. The relationship between sleep duration and health is U-shaped, with the lowest risk around 7–8 hours.
How to Determine Your Personal Sleep Need
While averages provide a guide, individual needs vary. To find your optimal sleep duration, try this method: during a vacation or a period without an alarm, go to bed when you feel tired and wake naturally. After a few days, note the average sleep time—this is your natural need. Most adults will land between 7 and 9 hours. Also consider your daytime alertness: if you feel rested and do not rely on caffeine to stay awake, you are likely getting enough. If you need an alarm to wake up or feel sleepy during the day, you may be sleep-deprived.
Common Misconceptions About Sleep Averages
- “Everyone needs exactly 8 hours.” False. The normal range is 7–9 hours, and some people function well on 6 or 10 hours.
- “You can catch up on lost sleep on weekends.” Partially true, but chronic sleep debt is not fully reversible, and weekend oversleeping can disrupt your circadian rhythm.
- “Older adults need less sleep.” They need about the same amount (7–8 hours), but they often get less due to medical issues or fragmented sleep.
- “Sleeping more is always better.” No, oversleeping (over 9–10 hours) is linked to health risks, so aim for the sweet spot.
Frequently Asked Questions
Is 6 hours of sleep enough for some people?
A small minority of people (about 1–3%) have a genetic mutation (such as in the DEC2 gene) that allows them to function well on 6 hours or less. However, for the vast majority, 6 hours is insufficient and can lead to cognitive and health problems. If you feel rested on 6 hours, you may be part of that rare group, but it is wise to check with a doctor.
What is the average sleep time for teenagers?
Teenagers need 8–10 hours per night, but most get only 7–7.5 hours on school nights due to early start times, homework, and social activities. Chronic sleep deprivation in teens is linked to mood issues, poor academic performance, and increased accident risk.
Does sleep need change during pregnancy?
Yes. Pregnant women often need more sleep, especially in the first trimester, due to hormonal changes and increased fatigue. Many report sleeping 8–10 hours per night, though discomfort and frequent urination can disrupt sleep later in pregnancy.
How does shift work affect average sleep?
Shift workers—especially night shift workers—often average 5–6 hours of sleep per day because their circadian rhythm is misaligned with their work schedule. This can lead to “shift work sleep disorder,” characterized by insomnia and excessive sleepiness. Strategies like strategic napping and bright light exposure can help.
What is the average sleep duration in the United States?
According to the CDC’s 2020 report, about 65% of U.S. adults get at least 7 hours of sleep per night, meaning about one-third get less. The average self-reported sleep duration is around 7.1 hours on weekdays and 7.6 hours on weekends.
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