Blue light from screens has long been blamed for poor sleep, but new research suggests the issue may be broader than just screen exposure.
A BBC report details a study examining the effects of blue light elimination at bedtime on human eyes. Using blackout curtains and special goggles to test screen impact, researchers found screens had less effect than expected.
The concern about blue light arose after a 2014 study showed that people who used screens before sleep experienced later sleep times and lower melatonin production. Blue light affects our body’s internal clock system, which controls sleeping and waking cycles.
Experts now believe actual environments differ from laboratory experiments. Stanford University expert Jamie Zeitzer notes screen light has low power, unable to disrupt sleep at nighttime hours.
Studies show daytime light exposure has a stronger impact. People living indoors in modern times face restrictions that prevent them from seeing bright natural sunlight, losing their ability to distinguish between day and night. Outdoor light levels during cloudy weather reach about 10,000 lux, exceeding indoor brightness and phone screen brightness.
Experts recommend spending time outdoors in the morning and limiting light exposure after sunset for better sleep results. They also suggest focusing on how people use devices, as they believe device usage has more harmful effects than light exposure. The brain stays active during late-night scrolling, including engaging content and social media activities, leading to delayed sleep.
Zeitzer explains that people stay awake because they experience more content than actual light exposure. Combining essential bedtime practices with nightly blue light elimination provides better sleep benefits than eliminating blue light alone. Effective methods include dimming lights in the evening and increasing daytime light while maintaining consistent sleep patterns.