Screens, blue light and sleep

How screens and blue light affect sleep, and realistic ways to manage evening device use.

2 min read · Awareness resource · Reviewed 2026-09-15

It is hard to imagine evenings without a screen nearby, but that glow before bed may be doing more to your sleep than you realise.

What it is

Screens emit blue-toned light that can suppress melatonin, the hormone that helps signal to your body that it is time to sleep. Beyond the light itself, screens also tend to keep our minds stimulated with news, messages and scrolling, which works against the calm state we need to fall asleep.

Signs to notice

Feeling wide awake after scrolling in bed, even when you are tired.
Losing track of time on your phone late at night.
Checking work emails or social media right before sleep and feeling more alert or anxious afterwards.
Waking up and immediately reaching for your phone.
Struggling to fall asleep on nights with heavy screen use versus nights without.

What helps

Set a screen curfew of thirty to sixty minutes before bed where possible. Even a small buffer helps.
Dim your phone and laptop screens in the evening, or use built-in night mode settings.
Move charging stations out of the bedroom so your phone is not the last and first thing you see.
Replace late-night scrolling with something calming, such as reading a physical book, light stretching or listening to quiet music.
If you must use a screen at night, hold it further from your face and keep brightness low.
Notice the content, not just the light. Stressful news or work messages can keep your mind racing long after the screen is off.

When to reach out for help

If you find you cannot switch off your phone even when you want to, or if screen use is tied to anxiety, comparison or difficulty relaxing, it may help to talk to someone. This is especially true if disrupted sleep is affecting your work, relationships or mood over several weeks.

Getting help in South Africa

Cleared Mind's EAP counsellors can help you build healthier routines around technology and rest, and explore what is driving the late-night scrolling in the first place. If anxiety is part of the picture, SADAG's Mental Health Line (011 234 4837) offers support and guidance on where to go next.