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The back-lit screens of televisions emit blue light, which helps explain why most sleep experts discourage keeping a TV in the bedroom. What Sources Emit Blue Light?Įlectronics and energy-efficient lighting are the primary sources of artificial blue light. But when it’s time to wind down, exposure to blue light can make it harder to fall and stay asleep. The energizing impacts of blue light can serve us during the day-for instance, when we’re trying to focus on work. Research has found that blue wavelengths have an energizing effect that can boost attention, improve mood, and increase reaction times. Blue light is also found within white light, which is a mixture of all the visible wavelengths on the color spectrum.Ĭompared to red light (which we’ll discuss later on), blue light has a higher frequency and carries more energy. Each of these lighting types comes from different sources in our everyday lives, and each of them can affect sleep either positively or negatively.Īrtificial blue light is emitted by blue wavelengths and is found in screen-based electronics as well as energy-efficient lighting. Artificial lights can emit a variety of light wavelengths, including blue, green, red, orange, white, and yellow. Light’s affect on sleep often varies depending on the type of light in question. And sleep can have a global impact on our health, from anxiety and depression to pain and heart disease. But exposure to all that artificial light can majorly impact our sleep. Without question, artificial lighting has improved our lives in a variety of ways. Our circadian rhythms learned to perk up our bodies upon exposure to morning light and wind down during the dark of the evenings. Human bodies evolved within these natural light-dark cycles. Work was conducted during the brightness of day, and people spent the evenings mostly in darkness-lit only by a few candles or an oil lamp. We take all this lighting for granted, but it’s actually a pretty new phenomenon.īefore artificial lighting was invented, people mainly relied on the sun for light.
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Fluorescent lights glare at us from the ceilings of offices or train stations streetlights shine down on us as we navigate urban sidewalks at night and the light of electronic screens beams at us whenever we look at a laptop, TV, or smartphone. These days, we encounter different types of lighting everywhere we go.