School is just around the corner for families across Hershey, Palmyra, Hummelstown, Campbelltown, and the rest of Central Pennsylvania. The backpacks are ready. The supply lists are done. But there's one thing many families don't think about until the night before the first day: sleep.

Summer has a way of pushing bedtimes later and later — and the internal body clock shifts right along with them. By mid-August, a child who once fell asleep at 9 p.m. may genuinely not feel sleepy until 11 p.m. or later. When the alarm goes off at 6:30 a.m. on the first day of school, many children aren't just tired. They're biologically out of sync.

The good news: you still have time to fix it. This post explains what happens to children's sleep over summer, why it matters more than most parents expect, and what you can do right now — before that first bell — to help your child head into the school year rested and ready.

What Is a Circadian Rhythm, and Why Does Summer Throw It Off?

Your body runs on an internal clock called the circadian rhythm — a roughly 24-hour biological cycle that governs when you feel alert and when you feel sleepy. This clock is set mainly by light exposure, meal timing, and physical activity patterns. During the school year, consistent early wake times act as an anchor for the clock. During summer, those anchors disappear.

When children have no reason to wake early, their natural tendency is to drift gradually later. Over weeks, the circadian system shifts to match — a child who was asleep by 9:30 p.m. in May may not feel that sleepy signal until midnight by August. This is sometimes called social jet lag: the gap between what your biology prefers and what your schedule demands.

For teenagers, the shift is especially dramatic — and it's not simply a matter of willpower. Research published in the NIH's PubMed Central shows that puberty triggers a biological delay in circadian timing of two to three hours, driven by hormonal changes in the brain's suprachiasmatic nucleus — the body's master clock. This phase delay is not laziness. It's biology. A teenager who can't fall asleep before midnight may be experiencing a genuine circadian mismatch, not defiance.

How Much Sleep Does Your Child Actually Need?

The American Academy of Sleep Medicine (AASM) publishes consensus guidelines on pediatric sleep that are endorsed by the Centers for Disease Control and Prevention (CDC). Here's what children need every night:

• School-age children (ages 6–12): 9–12 hours
• Teenagers (ages 13–17): 8–10 hours

These aren't rough estimates — they're the minimum ranges tied to healthy physical development, mood regulation, immune function, and academic performance. The actual numbers children are getting tell a different story. CDC data shows that more than 57% of middle school students and 72% of high school students report sleeping less than the recommended amount. A 2023 Youth Risk Behavior Survey found that only about 23% of U.S. teenagers get 8 or more hours of sleep on a typical school night.

That means roughly three out of four teenagers are walking into class chronically underslept — and most don't know it.

What Happens When Children Don't Get Enough Sleep?

Sleep is when the brain consolidates memories, clears metabolic waste, regulates hormones, and repairs tissue. Cut it short, and the effects show up everywhere.

According to the CDC, children and adolescents who do not get enough sleep face a significantly higher risk of obesity, type 2 diabetes, poor mental health, and injuries. They are also more likely to have attention and behavior problems — problems that directly impair academic performance.

The academic connection is striking. Research highlighted by the American Academy of Sleep Medicine found that children earning C, D, and F grades slept an average of 25 to 30 minutes less per night than classmates earning better grades — less than half an hour separating the honor roll from academic struggle. A 2022 review in the World Journal of Pediatrics confirmed that sleep deficiency affects children across the board: physical health (obesity), neurocognitive outcomes (memory, attention, academic performance), and emotional and behavioral functioning.

Dr. Julio Fernandez-Mendoza, a professor at Penn State College of Medicine in Hershey, has noted that "insufficient or out-of-sync sleep has been connected to learning problems, attention problems and cognitive issues." In clinical practice, sleep-deprived children are sometimes evaluated for attention disorders when the real issue is simply not enough rest.

Signs Your Child's Sleep May Be Off

You don't need a wearable tracker to spot sleep deprivation in children. Common signs include:

• Difficulty waking in the morning even after seemingly enough hours in bed
• Irritability, emotional outbursts, or mood swings disproportionate to the situation
• Falling asleep during car rides, on the couch, or in front of screens during the day
• Trouble concentrating on homework or simple tasks
• Craving sugary snacks or caffeinated drinks to stay awake
• Frequent colds or infections (chronic poor sleep suppresses immune function)

For teenagers specifically, watch for persistent low mood, loss of motivation, or a pattern of dramatically oversleeping on weekends to compensate for weekday sleep loss.

How to Reset Your Child's Sleep Schedule Before School Starts

With roughly two weeks left before most Central PA schools open their doors, there is still enough time to make a meaningful shift. Consistency is the engine here — not a single early bedtime, but a gradual, daily nudge in the right direction.

Start shifting bedtime and wake time gradually — now.
Move your child's bedtime and wake time 15 to 20 minutes earlier every two to three days. Abrupt changes rarely stick. A slow, steady shift lets the circadian system adjust without the shock of an overnight reset. If school starts August 25 and your child's bedtime has drifted to 11 p.m., you have just enough time to reach a 9:30 p.m. target if you start today.

Use morning light as an anchor.
Light is the most powerful signal your body's internal clock receives. Encourage your child to go outside or sit near a bright window within the first 30 minutes of waking. Morning light suppresses leftover melatonin and shifts the clock earlier over days. Evening light — especially screen light — does the opposite.

Set a firm screen curfew.
The American Academy of Pediatrics (AAP) recommends turning off all screens at least one hour before bed. Blue light from phones, tablets, and televisions suppresses melatonin production — the hormone that signals the brain to prepare for sleep. This is especially important for teenagers, whose brains are already biologically predisposed to produce melatonin later in the evening. A screen curfew at 9 p.m. for a 10 p.m. bedtime gives the body time to shift into sleep mode naturally.

Make the bedroom a sleep-first environment.
A cool bedroom — around 65 to 70°F — dark curtains, and minimal ambient light all signal to the brain that it's time to sleep. Charging phones outside the bedroom removes the temptation that undermines even the best-intentioned screen curfews.

Build a consistent wind-down routine.
The brain is a pattern-recognition machine. A predictable 20- to 30-minute pre-sleep routine — a warm shower, light reading, a few minutes of journaling or stretching — trains the nervous system to shift gears. The same sequence every night, at the same time, reinforces the sleep cue faster than any supplement.

Watch afternoon caffeine carefully.
Caffeine has a half-life of roughly five to six hours in adults — and potentially longer in children and teens whose bodies process it differently. A soda, energy drink, or sweet tea consumed at 4 p.m. can still be disrupting sleep at 10 p.m. Cutting off caffeine by early afternoon makes a real difference.

Keep the weekend schedule close to the weekday schedule.
This is where many families undo their progress. Allowing children to sleep two or three hours later on Saturday and Sunday effectively resets the clock backward — creating a mini-bout of jet lag every Sunday night. Keeping weekend wake times within one hour of the school-day schedule protects the gains made during the week.

A Note on Melatonin Supplements

Many parents reach for melatonin gummies when their child can't fall asleep. It's widely available, perceived as natural, and feels like a harmless solution. But the evidence calls for caution.

The American Academy of Sleep Medicine issued a health advisory in 2023 emphasizing that most pediatric sleep problems respond well to consistent schedules and behavioral changes — and that melatonin should not be a first-line approach for otherwise healthy children. Annual pediatric melatonin ingestion reports to U.S. poison control centers rose from approximately 8,000 in 2012 to more than 52,000 in 2021, with 15% of those cases requiring hospitalization. Because melatonin is sold as a dietary supplement, it faces less regulatory oversight than pharmaceuticals — and studies have found that actual melatonin content in products can vary dramatically from what the label says.

If you are considering melatonin for your child, have that conversation with your pediatrician or family medicine provider first. In specific circumstances — such as schedule resets after travel or for children with certain neurodevelopmental needs — it can be appropriate, but the dose, timing, and duration matter and should be guided by a clinician who knows your child.

How Three Angels Family Practice Approaches Pediatric Sleep

At Three Angels Family Practice & Wellness Center in Hershey, PA, Dr. Danette J. Joseph, MD takes an integrative approach to family health — one that treats sleep as a foundational pillar, not an afterthought. Sleep is inseparable from a child's nutrition, immune health, mood, and school performance.

If your child consistently struggles to fall asleep, stay asleep, or wake up refreshed — or if the signs above sound familiar — it's worth raising at a well-child visit. There are effective behavioral strategies, and sometimes underlying issues deserve a closer look: anxiety, obstructive sleep apnea, or iron deficiency can all quietly disrupt sleep for months. A back-to-school physical is an ideal time to address all of it.

Talk with Dr. Joseph

If you'd like to discuss your child's sleep or schedule a back-to-school health visit, Dr. Danette J. Joseph, MD — our board-certified family medicine physician at Three Angels Family Practice & Wellness Center in Hershey, PA — is welcoming new patients. We also serve families in Palmyra, Hummelstown, Campbelltown, and Middletown.

Request an appointment online or call (717) 298-1268.

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Medical disclaimer: This article is for general educational purposes and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about a medical condition or before starting, stopping, or changing any treatment. Reading this article does not create a physician-patient relationship with Dr. Danette J. Joseph or Three Angels Family Practice & Wellness Center.