What Time Should a 13-Year-Old Go to Bed?

Most 13-year-olds should be asleep somewhere between 8:30 and 10:00 p.m. on school nights, though the exact time depends on when they need to wake up. The American Academy of Sleep Medicine recommends that teenagers aged 13 to 18 get 8 to 10 hours of sleep per 24 hours for optimal health, so the simplest approach is to count backward from the morning alarm.¹ That sounds straightforward, but biology, school schedules, screens, and social pressure all conspire to push actual bedtimes later than they should be.

How to Calculate the Right Bedtime

Start with the time your teen has to be out of bed on a school morning. If the alarm goes off at 6:30 a.m. and they need about 15 minutes to actually fall asleep after lights-out, they should be in bed by 9:15 p.m. to land in the middle of the 8-to-10-hour range. A teen who wakes at 7:00 a.m. has a bit more room and can aim for 9:30 or 9:45 p.m. One who catches a bus at 6:15 a.m. and needs to be up by 5:45 faces a much harder math problem, because getting 9 hours means being asleep before 9:00 p.m., which most 13-year-olds will find almost impossible.

The 8-to-10-hour window is broad for a reason. Some kids genuinely function well on 8 hours; others are groggy wrecks without 9.5. A good test is to watch what happens on vacation or long breaks when there is no alarm. If your teen naturally sleeps about 9 hours and wakes up feeling rested, that is their personal target. Build the school-night bedtime around that number, not around what is socially convenient.

Why 13-Year-Olds Fight Going to Bed

Around puberty, the internal clock shifts later. Researchers describe several overlapping factors: the circadian rhythm itself lengthens and delays, sensitivity to the wake-up signal of morning light drops, and cognitive arousal in the evening ramps up.² The net result is that a 13-year-old’s brain starts releasing melatonin later than it did at age 10, making them genuinely not sleepy at 9:00 p.m. even if they were perfectly happy going to bed at that time a couple of years earlier.

One piece of the puzzle that researchers initially expected to find has turned out to be less clear-cut. A study tracking boys through early adolescence found that the buildup of sleep pressure across the day, the drowsy feeling that accumulates the longer you stay awake, did not actually change during this period.³ So the issue is not that 13-year-olds feel less tired overall. They do feel tired. Their clock is just telling them the tiredness means “soon” rather than “now.”

This is worth understanding because it changes how you approach the problem. Telling a 13-year-old who isn’t biologically sleepy to “just go to sleep” is about as useful as telling someone who isn’t hungry to eat a full meal. The better approach is to work with the biology: shift the cues that help the clock wind down, rather than simply issuing a lights-out decree and walking away.

What Happens When They Don’t Get Enough

The consequences of short sleep at this age show up fast and across multiple areas.

Mood and Emotional Regulation

An experimental study that restricted adolescents’ sleep and then compared them with the same teens after healthy sleep found that the short-sleep period brought significantly higher anxiety, hostility, confusion, and fatigue, along with less energy. Parents and the teens themselves reported more irritability and poorer emotional control during the restricted phase.⁴ If your 13-year-old seems to have turned into a different, much angrier person, sleep debt is one of the first things worth investigating.

Academics

Research on middle-school students specifically has found that academic performance peaks at around 8 hours of sleep per night and drops as sleep gets shorter. Students whose school started before 7:45 a.m. were at higher risk for both reduced sleep and lower grades.⁵ The link is not just about being drowsy in class. Sleep is when the brain consolidates what was learned during the day, so losing hours of sleep means losing some of the work that studying accomplished.

Physical Health and Growth

Sleep and growth hormone secretion are closely linked, and short sleep is associated with both obesity and disrupted metabolic function.⁶ In obese adolescents, researchers have found that inadequate sleep sets off a chain of hormonal changes: cortisol goes up, stress-related hormones increase, testosterone and thyroid-stimulating hormone drop, and growth hormone patterns get disrupted. Together, these changes contribute to insulin resistance.⁷ For a 13-year-old in the middle of a growth spurt, this is particularly poor timing.

Screens Are a Bigger Problem Than Most Parents Think

You have probably heard that screens before bed are bad for sleep. The research backs that up emphatically: in a review of the literature, the vast majority of studies found that screen use was associated with later bedtimes, shorter total sleep, or both.⁸ The mechanism goes beyond blue light, which gets the most attention. Screens also keep the mind engaged and aroused, make it easy to lose track of time, and create social obligations (group chats, streaks, notifications) that feel urgent at midnight.

A practical approach that families have found workable is a charging station outside the bedroom. The phone goes on the station at a set time, say 30 to 45 minutes before the target bedtime, and stays there until morning. This removes the most powerful sleep disruptor from arm’s reach without making it feel like a punishment. If your teen insists they need the phone as an alarm, a cheap alarm clock solves that objection.

Caffeine and the Afternoon Cutoff

Many 13-year-olds drink caffeinated soda, iced coffee, or energy drinks without thinking about it as a sleep decision. Research measuring sleep with brain-wave monitors, not just self-reports, found that higher caffeine intake in adolescents was linked to longer time falling asleep, less total sleep, lower sleep efficiency, and less REM sleep. The effects were driven by afternoon and evening consumption specifically.⁹

There is some individual variation here. A randomized trial in male adolescents found that the response to caffeine differed quite a bit from person to person, and at lower doses relative to body weight the sleep-disrupting effects were harder to detect at a group level.¹⁰ Still, the safest rule of thumb is no caffeine after early afternoon. A 13-year-old who drinks an energy drink at 4:00 p.m. is essentially volunteering to lie awake an extra 15 to 30 minutes or more that night.

The School Start Time Problem

Even the most disciplined bedtime routine can only do so much when a school bus comes at 6:30 a.m. A broad review of studies found that later school start times consistently led to more sleep, mostly because students slept in a bit later while their bedtime stayed roughly the same. Even modest delays of about half an hour showed meaningful gains. Later starts also corresponded to better attendance, less falling asleep in class, and better grades.¹¹

For middle schoolers, the data is especially stark. In one study, about 45 percent of students whose school started early were getting 7 hours or less, well below the recommended minimum.⁵ If your 13-year-old’s school starts before 8:00 a.m., the gap between biology and obligation is at its widest, and the bedtime calculation becomes all the more important to take seriously. You cannot control when school starts, but knowing that the schedule is working against your teen’s biology can help you prioritize protecting sleep on the other end of the night.

Weekend Catch-Up Sleep Is Not a Fix

Plenty of teens barely scrape by on sleep during the week and then sleep until noon on Saturday and Sunday. This pattern has a name in sleep research: social jetlag. A large study of high-school students confirmed that circadian timing shifts substantially from the school week to the weekend, and that teens whose internal clocks ran latest showed the most extreme weekend catch-up.¹²

You might assume that extra weekend sleep at least partly repairs the damage of a short school week. But research on adolescent well-being paints a more complicated picture. Among teens sleeping under 7 hours on school nights, those who caught up by more than 2 hours on weekends actually reported lower well-being than those who caught up by less than an hour.¹³ The likely explanation is that huge weekend-to-weekday shifts function like flying across time zones every Monday morning. The body never fully adapts to either schedule.

The practical takeaway is to keep weekend wake times within about an hour of school-day wake times if possible. Sleeping in a little is fine; sleeping in until 1:00 p.m. makes Monday morning worse, not better.

Chronotype Matters More Than Most People Realize

Chronotype is a person’s natural preference for when they feel alert and when they feel sleepy. Some people are naturally early risers, some are naturally night owls, and most fall somewhere in the middle.¹⁴ This is partly genetic and shifts during adolescence toward the evening. A 13-year-old who is already an evening type by nature may be fighting an even steeper uphill battle against an early school schedule than their morning-type classmates.

Interestingly, exercise timing may interact with chronotype. A study of young adolescent athletes found that high-intensity training in the early evening, compared to the afternoon, led to lower sleep efficiency and a longer time to fall asleep.¹⁵ For a 13-year-old with evening practices that end at 8:00 or 9:00 p.m., this can push sleep onset even later. If sports scheduling allows any flexibility, afternoon training may be the better option for protecting sleep.

When a Delayed Clock Becomes a Clinical Problem

The normal adolescent shift toward later sleep can, in some teens, cross the line into what clinicians call delayed sleep phase disorder. The hallmark is that a teen cannot fall asleep until very late, sometimes not until 1:00 or 2:00 a.m., even when genuinely trying. They then cannot wake up at a socially required time without severe difficulty. When they are allowed to sleep on their own schedule, the sleep itself is normal in quantity and quality. The mismatch between internal timing and external obligations is the entire problem, and it puts affected teens at higher risk for depression, substance use, and poor school performance.¹⁶

If your 13-year-old consistently cannot fall asleep until well past midnight despite good sleep habits and limited screens, it is worth discussing with a pediatrician or a sleep specialist rather than assuming it is simply willpower or defiance. Light therapy in the morning and carefully timed melatonin are among the treatments that have shown promise for this condition.

Practical Habits That Actually Help

The general category of “sleep hygiene” gets thrown around a lot, but several specific strategies have been tested with adolescents and shown to work.

Consistent schedule: Going to bed and waking up at roughly the same time every day, including weekends within an hour or so, is the single most powerful cue for the circadian clock.
Wind-down routine: A predictable 30-minute buffer before bed, involving low-stimulation activities like reading, stretching, or a warm shower, signals the brain that sleep is coming.
Cool, dark room: The body’s core temperature needs to drop for sleep to initiate easily. A slightly cool room and blackout curtains help.
Bed is for sleeping: Doing homework, watching videos, or scrolling in bed trains the brain to associate the bed with wakefulness. Keeping other activities out of the bed strengthens the association between lying down and falling asleep.

When these basic strategies are not enough, more structured approaches can help. A smartphone app designed for adolescents that combined sleep-habit education, stimulus control, and cognitive techniques showed significant improvements in insomnia symptoms, sleep quality, and even depression and anxiety scores in a pilot evaluation.¹⁷ Cognitive behavioral therapy for insomnia, whether delivered by a therapist or through digital tools, has been shown in systematic reviews to improve how quickly teens fall asleep, how efficiently they sleep, and how they rate their own sleep quality.¹⁸

Family and Household Factors

Sleep does not happen in a vacuum. Research on family dynamics and sleep has turned up a finding that surprises many people: higher household income was associated with longer adolescent sleep, but greater parental education was associated with shorter sleep duration and also with less variability in how long teens slept from night to night.¹⁹ The researchers suggested that more-educated parents may enforce earlier wake times or busier schedules, which cuts into total hours even while making those hours more consistent. The short version: structure is good, but overloading a 13-year-old’s schedule can eat into sleep just as much as chaos can.

Cultural norms also play a large role. A systematic review of cross-cultural studies found that young people in Europe, North America, and Australasia tend to have earlier bedtimes, earlier wake times, and longer nighttime sleep compared to peers in Asia and the Middle East. Countries in the Middle East had the latest bedtimes and the shortest total sleep, while countries in Asia had more habitual napping to partially compensate for shorter nighttime sleep. These differences are shaped by evening family social routines, cultural attitudes toward bedtime, and whether practices like afternoon naps are normal in a given society. There is no single “correct” schedule that applies worldwide; the key is whether total sleep across 24 hours falls in the recommended range.

Exercise Timing and Evening Activities

Physical activity during the day generally helps sleep, but timing matters for teens. As noted earlier, high-intensity exercise in the early evening has been linked to worse sleep efficiency compared with afternoon exercise in young adolescent athletes.¹⁵ This does not mean a 13-year-old who has evening soccer practice is doomed to poor sleep, but it does mean they may need a longer wind-down period afterward. Jumping from intense physical activity straight into bed rarely works. A post-practice cooldown period of at least 30 to 45 minutes, with low lighting and calm activity, can help bridge the gap between exertion and sleepiness.

Heavy meals close to bedtime can also delay sleep onset, though the evidence in adolescents specifically is thinner. A reasonable guideline is to finish eating at least an hour or two before lights-out, especially if the meal is large or high in sugar.

When to Involve a Doctor

Most 13-year-olds who struggle with bedtime do not have a sleep disorder. They have a mismatch between their biology and their schedule, compounded by screens and caffeine. But some red flags warrant professional attention:

Snoring or gasping: This can indicate obstructive sleep apnea, which prevents restful sleep regardless of how many hours are logged.
Inability to fall asleep before 1:00 a.m.: As described above, a persistent pattern despite good habits may be delayed sleep phase disorder.
Excessive daytime sleepiness: If your teen is sleeping 9 hours and still cannot stay awake during the day, the quality of sleep may be poor even if the quantity looks fine.
Sleep-related anxiety: Some teens develop intense worry about not being able to sleep, which creates a self-fulfilling cycle. This is where structured cognitive behavioral approaches tend to be most effective.

A pediatrician can screen for underlying conditions, and a referral to a sleep specialist is appropriate if basic interventions have not worked after a few weeks of consistent effort. Melatonin supplements are widely available over the counter, but the dose, timing, and formulation matter, and using them without guidance can sometimes make the problem worse by reinforcing the wrong timing signal.