Why screens make it harder to switch off at night

You've been staring at screens all day. Work emails on your laptop, messages on your phone, a bit of scrolling through social media. Then you get into bed, pull out your phone "just to check one thing," and suddenly it's an hour later, and you're still awake. Screens make it harder to switch off at night cause they're actively telling your brain to stay awake when it should be winding down.

What blue light does to your brain

Your body produces melatonin, the hormone that makes you feel tired. But blue light exposure from smartphone screens, tablets, and watching TV can suppress melatonin production.

Research shows that exposure to blue light before bedtime can delay natural sleep onset by up to 90 minutes. That's a massive chunk of your sleep duration gone just because you were scrolling.

Blue light emitted from screens tricks your brain into thinking it's still daylight. Your circadian rhythm (your body's internal clock that tracks when the sun rises and sets) gets confused. Light exposure at night can cause a phase delay, pushing your sleep-wake cycle later.

The overall intensity of light affects sleep too, not just blue light. Bright screens keep your brain alert. Household LED lighting contributes to the disruption. Even using dark mode or night shift features, you're still getting significant light exposure.

Mental stimulation keeps you wired

It's not just about the light. The content you're consuming matters.

Watching your favourite shows, scrolling through social media, responding to emails, and playing games all create mental stimulation that makes it harder for your nervous system to calm down. Your brain alert state continues long after you've put the phone down.

Social media is particularly problematic. Fear of Missing Out (FOMO) can cause anxiety that hinders relaxation. Digital fatigue from constant information consumption can lead to mental exhaustion and irritability.

Cognitive engagement from these screen activities can prevent the relaxation you need before bed. Even "mindlessly scrolling" means your brain is still processing information, reacting to content. That's not rest.

The numbers are worse than you think

Studies show that each additional hour of screen time before bed is linked to a 59% increase in insomnia risk. Screens can double the time it takes to fall asleep when you're using them in bed. Most people look at screens for an hour before bedtime. And those same people report poor sleep quality.

This affects more than just how tired you feel in the morning. Poor sleep can impact your mental and physical health, academic performance, work performance, and mood. Shorter sleep duration from screen use may contribute to anxiety and other mental health concerns over time.

Creating better screen habits

You don't have to throw your phone away. But you do need boundaries.

• Set a digital curfew: experts recommend stopping screen use at least 60 to 90 minutes before bedtime. Pick a time and stick to it.

• Keep screens out of the bedroom: Make your bedroom a screen-free zone. Charge your phone in another room, don't keep the TV on, and if you need an alarm, get an actual alarm clock.

• Create a transition window: During the hours before sleep, shift from stimulating to calming activities. If you must use screens earlier in the evening, choose calm, low-stimulation content.

• Use tech features wisely: Night Shift, dark mode–these can help reduce the harsh glow from screens, but they're not a free pass to scroll until midnight.

• Dim your screens: If you're using devices in the evening, turn the brightness down. Dimmer is better for reducing the impact on melatonin.

• Try grounding cues: Some people find that pairing limited screen time with calming activities, like sipping herbal tea whilst reading something gentle, can help their bodies associate that time with winding down.

• Replace screens with relaxing activities: Nighttime reading (physical books, not e-readers), listening to calming music, and gentle stretching. These don't come with blue light exposure or mental stimulation.

• Get daylight exposure: Prioritising daytime light exposure can help regulate your circadian rhythm and reduce your brain's sensitivity to disruptive evening light. Get outside in the morning when the sun rises.

• Check your habits: Reflect on how different types of screen time affect your mood and ability to fall asleep. Watching certain shows makes you feel more awake? Stop watching them before bed.

Why this matters

Better sleep isn't just about feeling less tired. It affects your physical health, your mood, and your ability to think clearly. When you're constantly getting poor sleep because of screen habits, everything else gets harder.

The goal isn't perfection. You're not going to never look at your phone in the evening again. But reducing screen time in those crucial hours before bed can make a real difference in how quickly you fall asleep and how well you stay asleep.

So maybe tonight, try putting the phone down an hour earlier. See what happens. You might actually fall asleep when you want to instead of lying there awake, scrolling, wondering why you feel tired but can't switch off.