Screens and Light

Light is the most powerful signal controlling your body clock. Modern screens can unintentionally tell your brain that it is still daytime.

How Light Controls Sleep

Exposure to light helps regulate your circadian rhythm. During the day, light promotes alertness and helps keep your internal clock aligned.

In the evening, darkness allows the brain to release melatonin, a hormone that helps prepare the body for sleep.

        Bright light in the evening can delay melatonin production and make it harder to fall asleep.
    

Why Screens Can Be a Problem

Phones, tablets, computers and televisions emit light that may interfere with the body's natural preparation for sleep.

Can delay feelings of sleepiness.
May make it harder to fall asleep.
Can reduce overall sleep duration.
Interactive content can increase mental alertness.

Practical Tips

Avoid screens for 30–60 minutes before bed when possible.
Use night mode or blue-light reduction settings in the evening.
Dim household lighting during the hour before bedtime.
Keep phones away from the bedside if notifications disturb sleep.
Get natural daylight exposure early in the day.

Morning Light Is Just as Important

Exposure to daylight soon after waking helps strengthen circadian rhythms and improves the timing of sleep later that night.

Try to spend at least 20–30 minutes in natural daylight each morning whenever possible.

Key Takeaway

Sleep is influenced by both darkness at night and light during the day. Managing light exposure can significantly improve sleep quality and consistency.

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