How Does Screen Light Affect Sleep?

By Brandon Peters, MD

In a world increasingly dependent on technology, bright screens are more commonly part of our everyday life. These screens range broadly in size and purpose: televisions, computers, tablets, smartphones, e-books, and even wearable tech. How does this artificial light, especially when viewed at night, potentially impact our sleep? Learn how light at night affects our body’s circadian rhythm and whether it might contribute to insomnia and difficulty awakening. In addition, consider ways to reduce light exposure and counteract its effects.

Before Thomas Edison and His Light Bulb

It is hard to imagine a time before artificial light existed. It is such an integral part of our lives that we consider ourselves deeply inconvenienced when we lose power in a storm. Think back to what life was like before modern technology like computers and televisions, before light bulbs, and even before electricity.

Primitive societies and people were highly dependent on the natural availability of light. The sun ruled life. It is no surprise that it was worshiped in ancient Egypt. When artificial light became possible, things dramatically changed.

The Influence of Light on the Body’s Functions

All life on Earth has developed patterns of activity dependent on the timing of day and night. When isolated from the natural environment, innate circadian patterns will be revealed. As an example, most humans have an internal clock that runs just over 24 hours in length. However, light profoundly affects the timing of sleep and wakefulness, metabolism, and hormone release.

Morning sunlight has a key influence on life’s functions. It promotes wakefulness and ends sleep. It can help shift the desire for sleep slightly earlier. In the winter, when sunlight comes later, we may want to sleep in or suffer from symptoms called winter depression.

Due to the length of our internal clock, our bodies have a natural tendency towards delay in the timing of our sleep. This means that we always find it easier to go to bed and wake later. Have you ever noticed how easy it is to stay up another 15 minutes but how difficult it is to wake just 15 minutes earlier? Morning sunlight can profoundly reset this internal clock.

How Artificial Light at Night Impacts Sleep

Unfortunately, artificial light at night can negatively affect the timing of our sleep. Light shifts sleep timing, and light at night can shift our desire for sleep later. This can result in difficult falling asleep, as occurs with insomnia. Night owls, or those with delayed sleep phase syndrome, may be especially susceptible.

Not everyone is sensitive to these effects. If you are especially sleepy, perhaps due to inadequate total sleep time or poor sleep quality, you are unlikely to be impacted.

There are several important factors to consider:

The Source of Light

Artificial light can come from light bulbs and many other sources, including televisions, computers, tablets, smartphones, e-books, and even wearable tech. Each of these can generate a different intensity of light. Near screens may have more impact that those across a room.

The Amount of Light

Most overhead lights generate a light intensity that varies from about 500 to several thousand lux. For comparison, full sunlight at midday may be 100,000 lux in intensity. Commercially available lightboxes often generate about 10,000 lux. The screen of your smartphone may create hundreds of lux of light, depending on the settings you use. Even smaller amounts of light, such as from a tablet screen, may have an impact in some people.

The Color of Light

Much is made of the fact that blue light is responsible for shifting circadian rhythms. Full spectrum light – what you might consider as “white light” or “natural light” – contains the blue wavelengths. Blue-blocker sunglasses (with an amber or orange lens) and screen filters are sold to block this light wavelength.

The Timing of Light

One of the most important variables is when you are exposed to light, including from artificial sources. There is evidence that light at night could shift your desire for sleep by about 1 hour. This delays your ability to fall asleep and may impact your desire to wake in the morning.

Therefore, it is very important to turn down the lights at night, especially preceding your bedtime. Some people may need to avoid excessive artificial light exposure for the 1-2 hours before going to bed. This means turning off the phone, powering down the computer, and avoiding light from tablets, e-books, and other sources.

Instead, try to stick to low-tech options: listen to some music, read a book printed on old-fashioned paper, or page through a magazine. By reducing and eliminating your exposure to light at night, you may find that you are able to sleep better. If you continue to struggle, speak with a sleep doctor about additional treatment options.

How Being in College Can Disrupt Sleep

For many students, starting college is like stepping into an entirely new world. There’s a new living environment, new social opportunities, academic challenges, and often a level of independence they’ve never experienced before. While these changes can be exciting, they can also wreak havoc on one of the most important — and underrated — foundations of well-being: sleep.

College life, for all its energy and activity, is a perfect storm of factors that make it easy to push bedtime later, cut rest short, and live in a cycle of fatigue. And while an occasional late night is part of the college experience, chronic sleep disruption can have serious consequences for health, mood, and academic success.

Why Sleep Is So Vulnerable in College

College students are technically adults, but their sleep needs remain similar to late teens: most still require 7–9 hours per night to function optimally. Unfortunately, surveys show that many college students average only about 6–6.5 hours on school nights, and they often catch up on weekends — creating an irregular schedule that throws off the body’s internal clock.

Several intertwined factors contribute to the disruption:

1. A Shift in Autonomy

In high school, many students had parents reminding them to go to bed, limiting screen time, and enforcing wake-up schedules. In college, that external structure disappears. Students set their own bedtime, often guided more by social plans or looming deadlines than by biological needs.

2. Irregular Class Schedules

Unlike high school’s consistent timetable, college schedules can vary wildly. One day might have an 8:00 a.m. lecture, while the next has the first class at 1:00 p.m. This inconsistency makes it tempting to stay up late on “light” days and sleep in, which can shift the sleep cycle later and make early mornings harder.

3. Academic Pressures and Workload

College courses often require more independent study, heavier reading loads, and larger projects. It’s easy for work to spill into late-night hours — especially when procrastination or underestimating assignments comes into play. For students balancing jobs or internships on top of classes, evenings may be the only time left to study, pushing bedtime further back.

4. Social Opportunities at All Hours

One of the joys of college life is the ability to hang out with friends whenever you want — whether that’s watching movies at midnight, attending campus events, or going out. Many social activities take place in the evening or late at night, creating a constant temptation to stay up past a healthy bedtime.

5. Living Environment

Dorms and shared apartments are rarely havens of quiet. Roommates may have different schedules, and communal living can mean noise in the hallways, shared bathrooms, and late-night conversations just outside your door. Even students who want to sleep may find it challenging in a bustling residence hall.

6. Technology and Screen Time

Laptops, smartphones, and gaming consoles are ever-present in college life. Not only can they consume hours that could be spent sleeping, but the blue light from screens delays the release of melatonin, making it harder to fall asleep. Students who scroll through TikTok or game until 2:00 a.m. may not feel sleepy even if they know they should.

7. Substance Use

Caffeine is a staple for many students — from morning coffee to late-night energy drinks — but too much, especially in the afternoon or evening, can make it hard to wind down. Alcohol, while sometimes making people feel drowsy, actually disrupts sleep quality and can lead to more nighttime awakenings.

8. Stress and Anxiety

The transition to college can be stressful: moving away from home, adjusting to new academic expectations, managing finances, and navigating social dynamics. Stress hormones like cortisol can make it harder to fall asleep, and worries often feel louder at night when everything is quiet.

The Consequences of Chronic Sleep Disruption

While the occasional late night won’t derail most students, consistently poor sleep can take a toll:

• Weaker academic performance: Sleep is critical for memory consolidation and focus. Sleep-deprived students struggle more with attention, problem-solving, and retaining new information.

• Mood issues: Chronic sleep loss increases the risk of depression, anxiety, and irritability.

• Physical health problems: Poor sleep can weaken the immune system, making students more prone to illness.

• Safety risks: Sleep deprivation slows reaction times, increasing the risk of accidents, especially for students who drive.

How Students Can Protect Their Sleep

While the college environment makes good sleep a challenge, it’s not impossible to maintain healthy habits. Small, consistent changes can make a big difference.

1. Set a consistent sleep and wake schedule. Even if classes start later some days, try to wake up within an hour of your usual time. Get 15-30 minutes of sunlight upon awakening.

2. Create a wind-down routine. Dim lights, read, or listen to calm music 30–60 minutes before bed.

3. Limit caffeine after early afternoon. Switch to water or herbal tea in the evenings.

4. Use screens wisely. Set a “screens off” time before bed or use blue light filters if you must use devices late.

5. Optimize your sleep environment. Earplugs, white noise apps, blackout curtains, and comfortable bedding can counteract noisy or bright dorm conditions.

6. Manage workload earlier in the day. Tackling assignments in the afternoon can free up evenings for relaxation.

7. Communicate with roommates. Agree on quiet hours and be respectful of each other’s rest needs.

The Role of Campus Support

Many colleges now recognize the importance of sleep for student well-being and academic success. Some offer workshops on sleep hygiene, quiet study spaces for daytime work, and counseling services for stress management. Residence hall staff may also help mediate noise issues or support students struggling with adjustment.

The Bottom Line

Being in college disrupts sleep for many reasons — from late-night socializing and irregular schedules to noisy dorms and heavy workloads. While the culture often treats staying up late as a normal part of student life, the reality is that chronic sleep disruption can sap energy, harm academic performance, and affect mental and physical health.

College students who learn to prioritize and protect their sleep gain a significant advantage: more focus, better grades, steadier moods, and greater resilience. In an environment where so much feels new and out of control, sleep is one area where smart habits can make all the difference.

This article was created using OpenAI’s ChatGPT on August 15, 2025 and it was personally reviewed and edited by Brandon Peters, M.D. to ensure its accuracy. This use of augmented intelligence in this way allows the creation of health information that can be trusted.

Sleep and the Back-to-School Middle Schooler: What They Need and Why

The middle school years bring a whirlwind of change — new friends, tougher classes, bigger responsibilities, and a growing sense of independence. But one thing often gets overlooked during this transition: sleep. For 11- to 14-year-olds, getting enough high-quality rest isn’t just a nice idea — it’s essential for learning, mood regulation, and healthy development.

As summer fades and the school year begins, schedules shift earlier, homework piles up, and extracurricular activities kick in. Without careful planning, sleep can become the first casualty of the busy school routine. Understanding what middle schoolers need and how to help them get it can make the difference between a year of thriving and one of dragging.

How Much Sleep Do Middle Schoolers Need?

The American Academy of Sleep Medicine recommends 9–12 hours of sleep per night for children aged 6–12, and 8–10 hours for teens 13–18. That means most middle schoolers should be getting somewhere between 9 and 10 hours nightly.

But research shows many don’t. A CDC survey found that fewer than half of middle school students regularly get enough sleep on school nights. Late bedtimes, early alarms, and the lure of screens all contribute to the problem.

Why Sleep Is So Important in Middle School

Sleep affects middle schoolers in ways that are both immediate and long-term:

• Cognitive performance: Sleep helps consolidate memories, process new information, and support creative problem-solving. Well-rested students pay better attention in class and remember more of what they learn.

• Emotional regulation: Hormonal changes in early adolescence can amplify emotions. Adequate sleep makes it easier to handle stress, avoid conflicts, and recover from disappointments.

• Physical health: Sleep strengthens the immune system, supports growth, and helps regulate appetite and metabolism.

• Safety: Sleep-deprived students are more likely to make impulsive choices and have slower reaction times, which can be risky during sports, biking, or crossing streets.

The Middle School Sleep Challenge

Several factors make it harder for middle schoolers to get the rest they need:

1. Shift in circadian rhythm
   As children enter puberty, their natural “sleep phase” shifts later. Melatonin — the hormone that signals bedtime — is released later at night, making it harder to feel sleepy early.

2. Earlier school start times
   Many middle schools start before 8:00 a.m., which can require a wake-up time around 6:30 or earlier — out of sync with a teen’s biological clock.

3. Increased homework and activities
   Sports, music, clubs, and other commitments can push dinner, homework, and bedtime later.

4. Screen time
   Phones, tablets, and gaming consoles not only tempt kids to stay up later but also emit blue light that delays melatonin release even more.

Preparing for the Back-to-School Sleep Shift

If your middle schooler has been staying up and sleeping in during the summer, shifting back to a school schedule in one night will be a shock to the system. Start adjusting 1–2 weeks before school starts:

• Move bedtime earlier by 15 minutes every few nights.

• Wake them earlier in the morning to match the school-day schedule.

• Keep the schedule consistent on weekends to reinforce the body clock.

Building a Sleep-Friendly Evening Routine

A consistent wind-down routine can help counteract late-night energy and screen distractions. Consider a 30–45 minute bedtime ritual that might include:

1. Wrapping up homework and organizing the backpack for the next day.

2. Turning off all electronics at least 30–60 minutes before bed.

3. Taking a warm shower or bath.

4. Reading a book or listening to calming music.

Parents can help by setting a clear “screens off” time and charging devices outside the bedroom.

Creating the Right Sleep Environment

Middle schoolers may not think their bedroom setup affects their sleep — but it does. Encourage:

• Darkness: Blackout curtains or a sleep mask can help.

• Cool temperature: Around 65–70°F (18–21°C) is ideal.

• Quiet: White noise machines can mask household sounds.

• Comfortable bedding: A supportive pillow and breathable sheets make a difference.

Balancing Activities and Rest

Middle schoolers often want to “do it all,” but overscheduling can push sleep to the bottom of the priority list. Help your child balance commitments by:

• Limiting late-evening practices or events on school nights.

• Encouraging them to choose a manageable number of extracurriculars.

• Scheduling downtime after school before jumping into homework.

Watching for Signs of Sleep Deprivation

Even a shortfall of 30–60 minutes per night can add up over a week. Look for:

• Difficulty waking up in the morning

• Irritability or mood swings

• Trouble concentrating

• Frequent yawning or daydreaming

• Dozing off in the car or on the couch after school

If you see these signs, reevaluate bedtime and daily schedule.

Setting a Good Example

Kids this age notice when adults burn the candle at both ends. Modeling good sleep habits — such as sticking to a regular bedtime and limiting screens late at night — reinforces the message that rest matters.

The Takeaway for Families

Middle school is a period of rapid growth and increasing demands. Without enough high-quality sleep, students risk falling behind academically, feeling overwhelmed emotionally, and struggling physically. But with consistent schedules, mindful routines, and supportive boundaries, parents can help ensure their child gets the rest they need to thrive.

As the school year begins, remember: academic success starts the night before — with lights out, a quiet room, and the steady breathing of a child who’s truly recharging for the day ahead.

This article was created using OpenAI’s ChatGPT on August 15, 2025 and it was personally reviewed and edited by Brandon Peters, M.D. to ensure its accuracy. This use of augmented intelligence in this way allows the creation of health information that can be trusted.