Late nights linked to unhealthy eating and less activity in teens

Is your teen staying up previous midnight and sleeping in late? That behavior is perhaps doing greater than making mornings tough. A brand new study from Penn State School of Medication discovered that teenagers who maintain later bedtimes and wake instances have been extra prone to eat extra energy, snack extra, and be much less bodily energetic.

What the research discovered

Researchers studied 373 adolescents from the Penn State Youngster Cohort, a long-running, population-based research established in 2000. Contributors have been between the ages of 12 and 23, with a median age of 16.4 years.

Revealed within the journal Sleep Health, the research went past simply monitoring how lengthy teenagers slept. The researchers monitored sleep timing, regularity, and high quality utilizing wrist-worn wearables, self-reported surveys, and in-lab sleep research. Additionally they tracked meals and snack consumption and bodily exercise.

Teenagers who usually went to mattress after midnight and awakened after 8 a.m. consumed extra energy, particularly from carbohydrates, and have been extra sedentary. Additionally they snacked extra, notably later within the day and at evening. As a result of they slept in, many skipped breakfast. As a substitute, they ate a late-evening snack that tended to be much less wholesome than a typical breakfast. Teenagers with extremely variable sleep, switching between quick and lengthy nights, have been additionally much less bodily energetic general.

Why does sleep timing have an effect on consuming and exercise? The physique’s inside clock does greater than regulate sleep. It additionally governs metabolism, starvation, meals cravings, and the need to maneuver or relaxation. When teenagers have late or irregular sleep schedules, it may well throw these programs off.

These patterns have been about two instances stronger in the course of the college yr. When teenagers needed to get up early for college whereas their physique pushed them to remain up late, it triggered a cascade of unhealthy consuming and inactivity. Throughout breaks, the connection weakened. However snacking nonetheless elevated when youngsters have been out of college.

Why teen sleep issues

So why are so many teenagers combating sleep? Loads of it comes right down to biology. Throughout adolescence, the physique’s circadian rhythm and organic sleep drive shift to provide later sleep and wake instances. Teenagers are wired to remain up later and sleep later.

Nevertheless, early college begin instances work in opposition to this pure shift and might curtail sleep, have an effect on studying, negatively influence well being, and impair driving security. The AASM recommends that center and highschool begin instances be 8:30 a.m. or later. Greater than half of Individuals (54%) say college begins too early for these college students, and 90% of oldsters say early begin instances have an effect on their little one’s capability to get sufficient sleep on college nights.

The numbers inform the story. About 78% of highschool college students and 34% of youngsters don’t get sufficient sleep on a median college evening. The AASM recommends that teenagers ages 13 to 18 get 8 to 10 hours of sleep per evening to advertise optimum well being.

When college students persistently miss that focus on, it may well result in habits and studying issues, weight problems, diabetes, hypertension, and psychological well being issues. On the flip facet, getting sufficient high quality sleep helps college students excel within the classroom, carry out higher in sports activities, really feel extra optimistic, and keep a wholesome weight.

Wholesome sleep is about extra than simply complete hours. It additionally requires applicable timing, every day regularity, good high quality, and the absence of sleep problems.

This video explains why youngsters are biologically wired to be evening owls, the challenges they face getting sufficient sleep, and recommendation on construct optimistic sleep habits.

What dad and mom can do

The Penn State researchers counsel that bettering the timing and regularity of adlescent sleep could possibly be a key technique for more healthy habits general.

Mother and father and caregivers may help by encouraging earlier bedtimes, longer sleep period, and constant sleep schedules, particularly in the course of the college yr, whereas lowering late-night snacking and sedentary habits when youngsters are on break. Learn extra tricks to set up healthy sleep habits.

For extra details about wholesome teen sleep and sources for college students and oldsters, go to the AASM’s Student Sleep Health Week web page. Scholar Sleep Well being Week will happen Sept. 14-18, 2026.

Medical assessment by Ahmed Saleh, MD