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Blue light, a type of high-energy light, is part of the visible light spectrum. High-energy visible light (HEV light) is short-wave light in the violet/blue band from 400 to 450 nm in the visible spectrum, which has a number of purported negative biological effects, namely on circadian rhythm and retinal health (blue-light hazard), which can lead to age-related macular degeneration.
Cortisol levels are high upon waking and gradually decrease over the course of the day, melatonin levels are high when the body is entering and exiting a sleeping status and are very low over the course of waking hours. [9] The earth's natural light-dark cycle is the basis for the release of these hormones. [13]
Blue light is absorbed by the structural proteins, enzymes, and protein metabolites found in the lens. [9] The absorption of blue light creates yellow pigments in the lens's protein. The lens progressively darkens and turns yellow. [9] Blue light is absorbed by the lens, preventing blue light from reaching the retina at the back of the eye. [12]
Screens — including TV, your phone and your computer — provide blue light exposure that may impact sleep. “There’s a lot of data that says the light disrupts the circadian rhythm and ...
Emitted by a myriad of devices from televisions to phones and almost any display, blue light — a certain grade of high-energy light on the color spectrum — is certainly known to disrupt ...
Using technology before falling asleep can affect a student's sleep pattern. [13] The blue light that is emitted from the screens of cell phones, computers, and other devices stops the production of melatonin, [13] a hormone that controls the sleep-wake cycle of the circadian rhythm. [13]
Then those cycles are broken into stages within two categories: NREM sleep (non-rapid eye movement sleep) and REM sleep (also known as rapid eye movement sleep). Your brain activity changes during ...
Common sources of artificial light include outdoor lighting and the screens of electronic devices such as smartphones and televisions, which emit large amounts of blue light, a form of light typically associated with daytime. This disrupts the release of the hormone melatonin needed to regulate the sleep cycle. [9]