Blue Light, Screens, and Sleep: How to Protect Your Rest

Using computers, smartphones, or tablets before bed can disrupt sleep. The culprit is blue light—a high-energy, short-wavelength light that suppresses melatonin, the hormone that signals your body it's time to sleep.

The Science

• Melatonin production normally rises in the evening, lowering body temperature and alertness.
• Blue light from screens mimics daylight, tricking the brain into delaying melatonin release.
• Result: longer sleep onset, reduced sleep efficiency, and increased daytime sleepiness.

Evidence

Studies, including those by the National Sleep Foundation, consistently link pre-bed screen use with poorer sleep quality and next-day fatigue.

Practical Tips to Minimize Impact

• Power down 30–60 minutes before bed.
• Enable "night shift" or blue-light filter modes on devices.
• Dim screen brightness.
• Consider blue-light-blocking glasses if evening screen use is unavoidable.
• Establish a relaxing, screen-free bedtime routine (reading, stretching, meditation).
• Keep the bedroom cool, dark, and quiet.

Prioritizing these habits can significantly improve sleep onset, depth, and daytime alertness.