WTF Fun Fact 13660 – Blue Light and Sleep

Scientists have made some interesting discoveries about the connection between blue light and sleep.

Artificial lighting, particularly blue light from LED devices, has a notable impact on us. It disrupts melatonin production, the hormone responsible for regulating sleep, leading to potential sleep issues. But not all blue light is equal.

Blue Light and Sleep

LED lights in our gadgets and homes emit blue light, which ranges in wavelength from 380 to 500 nanometers (nm). However, not all blue light has the same effect. Wavelengths between 460 and 500 nm are particularly disruptive to melatonin production, impacting our ability to fall asleep.

In response to these challenges, researchers have developed innovative “human-centric” LEDs. These lights are designed to support natural circadian rhythms regardless of the time of day they are used.

The researchers created two types of LEDs, each emitting different wavelengths of blue light. One is tailored for daytime use, emitting blue light close to 475 nm, while the other, intended for evening use, emits blue light near 450 nm. This latter wavelength is outside the range known to disturb sleep.

Testing the New LEDs

The research team integrated these LEDs into conventional light bulbs, converting some blue light into red and green with phosphors, to produce white light. They then conducted an experiment in a windowless room, furnished with a desk, treadmill, and bed, equipped with these innovative bulbs.

Over a three-day period, male volunteers stayed in the room, exposed to different lighting conditions controlled by a computer. This setup allowed for a direct comparison between conventional and new LED bulbs.

Saliva samples collected from 22 volunteers revealed significant differences in melatonin levels based on the type of LED exposure. The use of the new LEDs resulted in a 12.2% increase in nighttime melatonin levels and a 21.9% decrease in daytime melatonin compared to exposure to conventional LEDs.

This suggests that the innovative LEDs could promote alertness during the day and enhance relaxation and sleep quality at night.

Towards a Brighter Future with Blue Light

This groundbreaking research has the potential to revolutionize the way we use artificial lighting. By aligning our indoor lighting with our natural circadian rhythms, we could improve overall well-being, work efficiency, and sleep quality. The hope is that manufacturers of LED lamps and electronic displays will implement these findings, creating environments that nurture our natural sleep-wake cycles. As we continue to spend significant time indoors, these advancements in lighting technology could be key to maintaining our health and productivity in the digital age.

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Source: “This next generation blue light could potentially promote or hinder sleep on command” — ScienceDaily


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