How Much Sleep Do You Need at Your Age?

Newborns and infants (0-11 months): building the clock from scratch

A newborn arrives with no circadian rhythm at all. Melatonin production doesn’t start until around 3-4 months, which is why a 2-week-old sleeps in scattered 2-4 hour blocks around the clock rather than one long stretch at night. Total sleep sits at 14-17 hours for newborns and 12-15 for infants, but it’s split across 3-5 short periods rather than consolidated — parents aren’t imagining the exhaustion.

By 6 months, most infants can physically sleep through a 6-8 hour stretch, though not all do. Active sleep, the infant equivalent of REM, makes up about half of total sleep time at birth and falls to the adult range of 20-25% by age 3. This isn’t wasted time: active sleep at this stage supports the fastest rate of brain growth in the human lifespan. The American Academy of Pediatrics also recommends back-sleeping through the first year specifically to reduce SIDS risk, independent of total hours slept.

Toddlers and preschoolers (1-5 years): the nap transition

Toddlers need 11-14 hours, typically including one or two daytime naps that consolidate into a single nap between 12 and 18 months. Preschoolers need 10-13 hours, and most drop the daytime nap entirely between ages 4 and 5 — which is exactly when an earlier bedtime (often 6-7 p.m.) has to pick up the slack. CDC 2024 data shows 42% of US preschoolers sleep under 10 hours, usually because bedtime hasn’t moved earlier to compensate for the lost nap.

Deep N3 sleep is doing heavy lifting at this age. It’s when growth hormone release peaks, and it’s tightly linked to language acquisition, motor skill consolidation, and emotional regulation the following day. A screen-free 30-minute wind-down before bed is the AAP’s top recommendation for this age group, since blue light exposure close to bedtime measurably delays sleep onset in young children.

School-age children (6-13 years): the hidden deficit

The NSF recommends 9-11 hours for school-age children, but CDC 2024 data shows 57% of US kids in this range sleep under 9 hours on school nights. The gap is usually small — 30 to 60 minutes — but it accumulates. Chronic mild sleep restriction in this age group has been linked to attention and behavior symptoms that closely mimic ADHD, and pediatricians increasingly screen for sleep habits before considering a formal ADHD evaluation.

Screens used within an hour of bedtime delay sleep onset by 20-30 minutes in this age group, per AAP 2016 guidance — a small effect per night that compounds over a school year. Two changes move the needle most: fixing a bedtime that allows for 9+ hours before the required wake time, and keeping screens out of the bedroom entirely rather than relying on “just for a few minutes” rules.

Teenagers (14-17 years): biology fights the school bell

Teens need 8-10 hours, but puberty pushes their circadian phase 2-3 hours later — a hormonally driven shift in the suprachiasmatic nucleus, not a discipline problem. A teenager who “can’t” fall asleep before 11:30 p.m. usually isn’t being defiant; their melatonin onset genuinely hasn’t started yet. Layer a 7 a.m. school start on top of that biology, and most US high schoolers are structurally sleep-deprived on weeknights no matter how motivated they are to go to bed earlier.

The data backs this up starkly: CDC’s 2024 YRBSS found 73% of US high schoolers sleep under 8 hours. When Seattle school district moved several high schools to an 8:45 a.m. start time, a 2025 follow-up study found students gained an average of 34 minutes of sleep per night, with measurable improvements in grades, attendance, and mental health scores — evidence that this is a scheduling problem, not a motivation problem.

Young adults and adults (18-64 years): the social jet lag decade

The NSF range holds steady at 7-9 hours from age 18 through 64, but the challenges shift by decade. Young adults (18-25) show the highest rates of “social jet lag” — the gap between weekday and weekend sleep schedules — which Roenneberg et al. 2012 linked to a 33% increase in obesity odds per hour of shift, plus elevated depression risk. Eveningness chronotype (a natural preference for later sleep and wake times) also peaks around age 21, then gradually shifts earlier through the 30s and 40s.

Adults 26-64 are the most chronically short-sleeping group in America: CDC 2024 data puts 35% of this group under 7 hours habitually. Van Dongen’s 2003 research is the most cited warning here — 14 nights at 6 hours produces cognitive performance equivalent to a full 24 hours of total sleep deprivation, but subjects only rate themselves as mildly sleepy. The mismatch between how impaired you actually are and how impaired you feel is, by most sleep researchers’ accounts, the single most dangerous feature of chronic partial sleep loss.

Older adults (65+): quality over quantity

The recommended range drops only slightly to 7-8 hours, but sleep architecture changes more than the number suggests. N3 deep sleep — the deepest, most restorative stage — declines by roughly 2% per decade starting in the 20s, according to a 2026 Sleep Medicine Reviews meta-analysis. Adults over 60 average just 3-8% N3, compared with 13-23% in younger adults. Earlier natural wake times and lighter, more fragmented sleep are age-typical, not necessarily a problem on their own.

What is worth flagging: an estimated 26% of adults aged 30-70 have obstructive sleep apnea, and the majority go undiagnosed, per Young et al. If someone in this age group gets a full 7-8 hours in bed but still feels persistently foggy or exhausted during the day, that’s a stronger signal to check for sleep-disordered breathing than to simply try sleeping longer.