What Time Should a 17-Year-Old Go to Bed?

A 17-year-old needs eight to ten hours of sleep per night, so the right bedtime depends on when they have to wake up. If the alarm goes off at 6:30 AM for school, that means lights out somewhere between 8:30 and 10:00 PM. That range sounds straightforward, but most 17-year-olds will tell you falling asleep at 9 PM feels impossible, and they are not wrong. Biology is working against early bedtimes in the late teen years, which is why the practical answer involves more than just picking a clock time.

The Eight-to-Ten-Hour Window

The American Academy of Sleep Medicine recommends that teenagers aged 13 to 18 sleep eight to ten hours per 24-hour period on a regular basis for optimal health.¹ The CDC echoes the same guideline.² That “per 24 hours” phrasing matters: it means any regular sleep your teen gets counts, not just the overnight block. But for most 17-year-olds, nighttime sleep is the only realistic opportunity for a long stretch, so the bedtime calculation is simple math. Count backward from the required wake-up time by at least eight hours, then add 15 to 30 minutes for the time it takes to actually fall asleep. A teen who needs to be up at 6:00 AM should be in bed by 9:30 PM at the latest. One who can sleep until 7:30 AM has more room and might aim for 10:30 or 11:00 PM.

Why Their Brain Wants to Stay Up Later

During puberty, the internal clock that governs sleepiness and wakefulness shifts later. This is not laziness or defiance. Sleep-wake timing genuinely drifts toward later hours across the second decade of life, driven by changes in both the body’s circadian rhythm and its sleep-pressure system.³ Research in both humans and other mammals suggests this delayed sleep phase during puberty is a widespread biological phenomenon, not something unique to teenagers with smartphones.⁴ Evening light exposure makes the shift worse, and early school start times clash directly with it.

In practical terms, a 17-year-old’s brain may not start producing strong sleep signals until 11 PM or later. Asking that brain to feel drowsy at 9:30 PM is like asking an adult to fall asleep at 7:00 PM. It can happen if the person is exhausted, but it fights the body’s natural rhythm. This mismatch between biology and school schedules is the core tension behind the bedtime question.

Social Jetlag and the Weekend Gap

When a teen goes to bed at midnight on weekends but drags themselves up at 6 AM on school days, the resulting mismatch in sleep timing acts like crossing time zones without leaving home. Researchers call this social jetlag. A large survey of nearly 20,000 students in England found the average social jetlag was about one hour and 53 minutes, peaking at roughly two hours and seven minutes around age 15.⁵ Boys tended to show slightly more social jetlag than girls, and weekend bedtime freedom along with social media and gaming before bed were the strongest predictors of a wider gap.⁵ Objective sleep monitoring data backs this up: teens show later sleep onset, longer time in bed, a greater proportion of light sleep, and worse sleep efficiency on weekend nights compared to school nights.⁶

A small amount of weekend catch-up sleep might offer some protection. One study of children and adolescents with insufficient sleep found that about an hour of weekend catch-up sleep was associated with lower rates of metabolic syndrome, following an L-shaped curve where more was not necessarily better.⁷ But when catch-up sleep becomes extreme, it stops helping. Adolescents sleeping fewer than seven hours on school nights who then caught up by more than two hours on weekends reported significantly lower well-being than those who kept their weekend overshoot under an hour.⁸ The takeaway is not “never sleep in on weekends” but rather that massive swings in sleep timing signal a problem that sleeping in alone cannot fix. A more consistent bedtime across the whole week does more good than a Saturday morning marathon.

What Happens When Sleep Falls Short

Most of the consequences of insufficient sleep in teenagers are not dramatic single events. They accumulate quietly. Insufficient sleep and disrupted sleep-wake patterns are common among adolescents worldwide and are tightly linked to depression and anxiety, though researchers are still untangling which direction the relationship runs.⁹ A longitudinal study that tracked teens over time found that late bedtimes predicted later emotional distress, alcohol abuse, cigarette use, and involvement in criminal activity, even after controlling for demographics and earlier behavior patterns.¹⁰ That study’s design is worth noting because it followed the same teens forward in time, meaning the late bedtimes came first and the negative outcomes followed.

On the body side, short and poor-quality sleep in adolescents disrupts hormones involved in appetite and metabolism. Teens who sleep less tend to gravitate toward calorie-dense, nutrient-poor foods and are at greater risk for obesity and metabolic problems both during adolescence and into adulthood.¹¹ The brain also takes a hit. Neuroimaging research on adolescents found that poor sleep was linked to greater risk-taking behavior, driven by reduced activity in the brain region responsible for cognitive control and heightened activity in reward-processing areas.¹² In other words, a sleep-deprived teen’s brain is worse at pumping the brakes and more responsive to things that feel exciting in the moment.

Driving and the Safety Angle

For many 17-year-olds, the most immediate real-world risk tied to poor sleep is behind the wheel. A study of adolescent drivers found that those who had been in at least one crash were significantly more likely to report driving while sleepy compared to those who had not crashed. Bad sleep quality nearly doubled the odds of a crash, and driving while sleepy roughly doubled them as well.¹³ This is not an abstract risk for a teenager who gets behind the wheel at 7 AM on five hours of sleep. If your teen drives to school, the bedtime question becomes a safety question in a very literal sense.

Screens, Caffeine, and the Pre-Bed Hours

Two common habits push bedtimes later than biology alone would dictate. The first is screen use. Blue light from phones and laptops delays the onset of melatonin production, and the cognitive stimulation from interactive content like social media and games disrupts sleep architecture even after the screen is off, increasing nighttime awakenings.¹⁴ The large English survey mentioned earlier found that frequency of social media use and video gaming before sleep were among the strongest predictors of social jetlag in adolescents.⁵

The second habit is caffeine, and the dose and timing both matter. A randomized clinical trial in adults found that 400 mg of caffeine, roughly the amount in a large energy drink or two strong coffees, caused significant disruption to sleep when consumed within 12 hours of bedtime. Sleep fragmentation increased when 400 mg was taken within eight hours of bedtime, and perceived sleep quality dropped by about a third when that dose came within four hours.¹⁵ A 100 mg dose, about one standard cup of coffee, did not significantly affect sleep at any timing. For a 17-year-old aiming to be asleep by 10 PM, that means any large caffeinated drink after noon is risky, and even moderate amounts after mid-afternoon could be a problem. Many teens are drinking energy drinks with 200 to 300 mg of caffeine after school without realizing those drinks are still active in their system hours later at bedtime.

Exercise Before Bed

Conventional wisdom says exercise helps you sleep, and over the course of days and weeks that is generally true. But timing matters for teens. Research on adolescents found that moderate-to-vigorous physical activity in the hours before sleep predicted more wakefulness during the night. Interestingly, the same pre-sleep activity also predicted falling asleep faster, so the trade-off is not simple.¹⁶ Activity during the day or after waking did not predict any changes in sleep quality in either direction. The practical implication: a late evening practice or workout is not necessarily a disaster, but if your teen is waking up multiple times a night, an 8 PM sports practice could be contributing. Morning or afternoon activity is a safer bet for sleep quality.

The Napping Trap

When teens do not get enough sleep at night, they often nap after school. Research tracking adolescents with actigraphy found that shorter nighttime sleep predicted longer napping the next day, which is intuitive. But the cycle works in both directions: napping during the day predicted shorter sleep and worse sleep efficiency that same night.¹⁷ A long afternoon nap can drain enough sleep pressure that the teen cannot fall asleep until midnight, which leads to another short night, which leads to another nap, and the cycle reinforces itself. If napping is happening regularly, it is a symptom of inadequate nighttime sleep, not a solution for it. Keeping naps under 20 to 30 minutes and finishing them before 4 PM helps limit interference with the evening bedtime.

Do Parent-Set Bedtimes Still Work at 17?

The idea of setting a bedtime for a near-adult might feel outdated, but the data suggests it still has value. A study of adolescents found that those with parent-set bedtimes went to bed earlier, slept longer, and reported better daytime alertness and less fatigue compared to those who set their own bedtimes.¹⁸ That does not mean a rigid “lights out at 9:30” enforced like it would be for a 10-year-old. For a 17-year-old, the effective version tends to be a collaboratively agreed-upon wind-down time: screens off at a certain point, in the bedroom by another, with the understanding that the household goes quiet. The English survey data is consistent with this. Having household rules around weekend bedtimes and electronics curfews was associated with less social jetlag, meaning more regular sleep timing across the week.⁵ The structure itself seems to help, even when the teen has input into what the rules are.

School Start Times and Their Outsized Role

No discussion of teen bedtimes is complete without acknowledging the elephant in the room: school start times. A large cross-sectional study of Norwegian high school students found that the earliest school starters averaged about six hours and 16 minutes of sleep on school nights, while the latest starters averaged seven hours and three minutes. Every 15 minutes of later school start was associated with about seven additional minutes of sleep.¹⁹ A review of 19 studies on the relationship between start times and bedtimes found mixed results: in most studies, later school starts did not push bedtimes later, meaning students actually gained sleep rather than just staying up later to compensate. Across 29 reports, later starts were linked to longer weekday sleep duration.²⁰

If your teen’s school starts at 7:15 AM and the bus comes at 6:40, the math is unforgiving. To get eight hours of sleep, they would need to be asleep by 10:15 PM at the absolute latest, meaning in bed by 9:45 or so. If school starts at 8:30 AM, the same eight hours requires being asleep by midnight, which is far more aligned with a 17-year-old’s natural rhythm. You cannot control when school starts, but being realistic about what the current schedule demands helps set an honest bedtime target rather than a wishful one.

Building a Realistic Bedtime Routine

Given all the forces pulling a 17-year-old’s sleep later, a realistic approach involves managing what you can control. The biggest levers, based on the evidence, are:

Consistent timing: Going to bed and waking up within the same 30-minute window every day, weekends included, reduces social jetlag and stabilizes the circadian clock. A two-hour weekend sleep-in is reasonable. A four-hour swing is working against you.
Screen cutoff: Stopping interactive screen use 30 to 60 minutes before the target bedtime reduces both the blue-light melatonin delay and the cognitive arousal from social media and gaming.
Caffeine cutoff: No large caffeinated drinks after lunch. A small amount of caffeine in the morning is unlikely to cause problems, but energy drinks consumed after school can still be active in the body at bedtime.
Nap limits: If napping happens, keep it under 30 minutes and finish before mid-afternoon to preserve nighttime sleep pressure.
Light exposure: Bright light in the morning, especially natural sunlight, helps anchor the circadian clock earlier. Dim light in the evening supports the natural rise of melatonin.

None of these will transform a natural night owl into someone who happily falls asleep at 9 PM. But together they can nudge the realistic window earlier by 30 to 60 minutes, which can be the difference between six hours of sleep and seven and a half.

When Delayed Sleep Becomes a Clinical Problem

Some teens struggle with sleep timing far beyond the normal adolescent shift. Delayed sleep phase syndrome typically emerges during the second decade of life and may represent an extreme version of the circadian and homeostatic changes that all teenagers experience.³ A teen with this condition might genuinely be unable to fall asleep before 2 or 3 AM, no matter how disciplined their routine, and then struggle enormously with morning wake-ups. If your 17-year-old has tried consistent sleep hygiene for several weeks and still cannot fall asleep within 30 minutes of a reasonable bedtime, or if daytime sleepiness is causing significant problems with school, mood, or safety, it is worth talking to a doctor. Light therapy in the morning, melatonin at carefully timed low doses, and sometimes cognitive behavioral therapy for insomnia are all approaches that have evidence behind them for this age group. What does not help is simply telling the teen to try harder to fall asleep, which tends to increase frustration and make the problem worse.

1
PubMed Central. Consensus Statement of the American Academy of Sleep Medicine on the Recommended Amount of Sleep for Healthy Children: Methodology and Discussion
2
Centers for Disease Control and Prevention. Sleep in Middle and High School Students
3
PubMed Central. Sleep, circadian rhythms, and delayed phase in adolescence
4
PubMed Central. Adolescent changes in the homeostatic and circadian regulation of sleep
5
PubMed Central. Social jetlag and sleep habits in children and adolescents: Associations with autonomy (bedtime setting and electronics curfew) and electronic media use before sleep
6
PubMed. Quantifying teenagers’ sleep patterns and sex differences in social jetlag using at-home sleep monitoring
7
PubMed. Protective association of weekend catch-up sleep with metabolic syndrome in Chinese children and adolescents with sleep insufficiency
8
PubMed Central. Different Effects of Social Jetlag and Weekend Catch-Up Sleep on Well-Being of Adolescents According to the Actual Sleep Duration
9
PubMed Central. Adolescent sleep and its disruption in depression and anxiety
10
PubMed Central. Risk Behaviors and Negative Health Outcomes for Adolescents With Late Bedtimes
11
Current Opinion in Endocrine and Metabolic Research. The relationship between sleep, obesity, and metabolic health in adolescents: A review
12
PubMed Central. The effects of poor quality sleep on brain function and risk taking in adolescence
13
PubMed Central. Sleep Quality and Motor Vehicle Crashes in Adolescents
14
Scholarly Review Journal. The effects of screen time on teen sleep
15
Sleep. Dose and timing effects of caffeine on subsequent sleep: a randomized clinical crossover trial
16
Sleep. How the Timing of Physical Activity Impacts Sleep Quality in Adolescents
17
PubMed Central. Temporal Relationships Between Napping and Nocturnal Sleep in Healthy Adolescents
18
PubMed Central. Time for Bed: Parent-Set Bedtimes Associated with Improved Sleep and Daytime Functioning in Adolescents
19
PubMed. Later school start time is associated with longer school day sleep duration and less social jetlag among Norwegian high school students
20
PubMed Central. School Start Times, Sleep, Behavioral, Health, and Academic Outcomes: a Review of the Literature