Sleep needs change significantly across your lifetime, ranging from up to 17 hours a day for newborns down to 7 or 8 hours for older adults. The CDC, American Academy of Sleep Medicine, and National Sleep Foundation all publish broadly consistent guidelines, and the ranges below reflect that consensus.
Recommended Sleep Hours by Age
- Newborns (0–3 months): 14–17 hours
- Infants (4–12 months): 12–16 hours, including naps
- Toddlers (1–2 years): 11–14 hours, including naps
- Preschoolers (3–5 years): 10–13 hours, may include a nap
- School-age children (6–12 years): 9–12 hours
- Teenagers (13–17 years): 8–10 hours
- Adults (18–60 years): 7 or more hours
- Adults (61–64 years): 7–9 hours
- Older adults (65+): 7–8 hours
These are totals for a full 24-hour period. For babies and toddlers, that includes daytime naps. For adults, it means actual time asleep, not just time spent in bed.
Newborns and Infants
Newborns split their sleep roughly evenly between day and night, logging about 8 to 9 hours during the daytime and another 8 hours overnight. They wake every 3 hours or so to feed, which is why continuous nighttime sleep is rare in the first few months. Most babies don’t sleep through the night (a stretch of 6 to 8 hours) until at least 3 months of age, and some don’t reach that milestone until closer to their first birthday.
By 4 to 12 months, total sleep needs drop slightly to 12 to 16 hours. Naps become more predictable, and nighttime stretches get longer. The wide range exists because individual babies vary a lot. If your infant is growing well, feeding normally, and alert when awake, they’re likely getting enough sleep even if they land at the lower end.
Toddlers and Preschoolers
Toddlers between 1 and 2 years old need 11 to 14 hours total. Most transition from two naps a day down to one, and that single nap gets shorter over time as more sleep consolidates into nighttime hours.
Preschoolers aged 3 to 5 need 10 to 13 hours. This is the age when kids gradually drop napping altogether. The process is rarely clean. A child might nap on some days but not others for weeks or months before naps disappear entirely. Once the afternoon nap fades, the full sleep total shifts to nighttime.
School-Age Children
Children between 6 and 12 need 9 to 12 hours of sleep per night. Naps are no longer part of the equation for most kids in this range. What changes instead is bedtime pressure: homework, screens, sports, and social activities all compete for evening hours. A 6-year-old who needs 11 hours and has to be up at 6:30 a.m. for school needs to be asleep by 7:30 p.m., which is earlier than many families realize.
Why Teenagers Stay Up Late
Teens need 8 to 10 hours, yet over 45% of adolescents in the United States get less than that. The shortfall isn’t just about phones and late-night socializing. Puberty physically rewires the brain’s internal clock.
During adolescence, the body builds up sleep pressure more slowly than it did in childhood, which makes it genuinely harder to feel tired at an early bedtime. At the same time, the internal clock shifts later. Teens’ circadian cycles run about 15 minutes longer than adults’, which sounds small but is enough to push their natural sleep and wake times later every day. Hormonal changes during puberty drive both of these shifts, and the effect correlates directly with stages of physical development rather than age alone.
Teens also become more sensitive to the wake-promoting effects of evening light and less responsive to morning light that would normally reset the clock. The result is a biological pull toward falling asleep later and waking later, which collides head-on with early school start times. This isn’t laziness. It’s physiology.
Adults 18 to 64
The standard adult recommendation is 7 or more hours per night for ages 18 to 60, with 7 to 9 hours recommended for the 61 to 64 range. Most healthy adults feel and function best somewhere between 7 and 9 hours, and consistently sleeping under 7 raises the risk of high blood pressure, heart disease, and diabetes over time. Short-term, even a few nights of poor sleep can impair memory, increase stress, and make you more prone to accidents and falls.
You may have heard of people who thrive on 4 or 5 hours. True short sleepers do exist, but the trait is genetic and extremely rare. Researchers have so far identified only about 50 families carrying the gene mutations linked to short sleeper syndrome. For everyone else, feeling “used to” less sleep usually just means you’ve adjusted to being chronically under-rested, not that your body needs less.
How Sleep Changes After 65
Adults 65 and older need 7 to 8 hours, slightly less than younger adults. But the structure of that sleep changes in ways that can make it feel less satisfying. Older adults spend proportionally more time in lighter sleep stages and less time in deep sleep and REM sleep. They wake more frequently during the night, take longer to fall asleep, and are more likely to nap during the day.
Here’s the reassuring part: most of these shifts happen between young and middle adulthood. Among healthy older adults past 60, sleep patterns actually stabilize. The people who struggle most with sleep in later life tend to have underlying health conditions, medications that disrupt rest, or pain that fragments nighttime sleep, rather than age itself being the sole cause.
Conditions like Alzheimer’s disease and other forms of dementia can cause dramatic sleep disruptions, including sleeping too much, sleeping too little, nighttime wandering, and daytime drowsiness. Poor sleep quality can worsen dementia symptoms, creating a cycle that also affects caregivers sharing the household.
Sleep Duration vs. Sleep Quality
Hitting the right number of hours matters, but so does how efficiently you actually sleep during those hours. Sleep efficiency is the percentage of time in bed that you spend asleep rather than lying awake. In younger adults, that figure tends to be high. With age, it drops: people wake more often, take longer to drift off, and spend more total time in bed to get the same amount of actual sleep.
If you’re in bed for 8 hours but awake for 90 minutes of that time, you’re only getting 6.5 hours of sleep. Tracking total time in bed can be misleading for this reason, especially for older adults. The recommended ranges refer to hours of sleep, not hours in bed.
Signs that your sleep quality may be poor regardless of duration include waking up unrefreshed, needing more than 30 minutes to fall asleep most nights, waking multiple times and struggling to fall back asleep, and relying on caffeine to function through the afternoon. If you’re logging the recommended hours but still feel consistently tired, the issue is more likely sleep quality than quantity.