Module 8 · Sleep & recovery · Moderate evidence

Screens before bed

It is less about blue light than you’ve heard, and more about what the screen keeps you doing.

6 min read · Level: Beginner · Free — no account needed to read

The idea

Screens in the hour before bed are linked with falling asleep later and sleeping less. The reasons are a mix: bright light can nudge your body clock later, but for most people the bigger issues are what the screen keeps you doing — staying up for one more episode, getting caught up in messages or news, or feeling alert from games and social media.

Night modes and blue-light filters reduce one small part of the problem, but they don’t stop an exciting show or a stressful message from waking your mind up.

A digital wind-down helps: set a time to put screens away, 30 to 60 minutes before bed, and replace them with something calmer. If you do use a screen, choose something calming and low-stakes, with the brightness down and notifications off.

Why it works

Reducing screens before bed is one of the simplest ways to fall asleep sooner — as long as something else fills the time.

A real example

The situation

Every night, Tarek watches videos in bed until he is too tired to keep his eyes open, often after 1am.

What happened

He sets a screens-away time of 11:30 and keeps a book and a podcast on his bedside table. He falls asleep around midnight, not 1am, and wakes up less groggy.

The takeaway

The screen wasn’t helping him sleep; it was keeping him from it.

Use this when you are…

• you use screens right up to sleep
• you go to bed later than you intended
• you feel wired at bedtime

Common mistakes

• Relying on night mode while still scrolling until you fall asleep.
• Reading stressful news or work messages late at night.
• Removing screens without a calm replacement.

What the evidence says

Moderate evidence: Several studies support it, but the effects are smaller, the studies are fewer or less rigorous, or results vary between groups.

Screen use before bed is consistently linked with later and shorter sleep. The direct effect of screen light is real but modest for most people; engagement and staying up later appear to matter more.

Where this comes from: Sleep and circadian research; Research on digital media and wellbeing.

Fields that study this: Sleep science, Behavioural science.

Try it now: Plan a screens-away time

1. Choose a time tonight, 30 to 60 minutes before bed, to put screens away.
2. Decide what calm thing you will do instead.
3. Set an alarm on your phone for the screens-away time.

Practise with a guided technique

• Digital sunset — (30–60 min before bed · Emerging evidence)
• Evening wind-down — (20–30 min · Moderate evidence)

Questions to think about

• What does your last screen of the evening usually involve?
• What calm activity could replace it?

Try this today

Put screens away 30 minutes earlier than usual tonight.

Afterwards, ask yourself

What changed when you put screens away earlier?

Words in this lesson

• Wind-down — A short, repeated evening routine that helps your body and mind shift toward sleep.