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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.
Allan Rechtschaffen (December 8, 1927 – November 29, 2021) [1] was a noted pioneer [2] [3] in the field of sleep research whose work includes some of the first laboratory studies of insomnia, narcolepsy, sleep apnea, and napping. He received his PhD from Northwestern University in 1956. [4] He did research in the effects on sleep of exercise ...
Van Halen modified the Frankenstrat several times. This photo shows the guitar in its final state, with red-over-white-over-black paint job. The top two pickups have been replaced with company electronics: the center one with a selector switch and the upper one with a red single-coil made in 1931, pickup.
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]
Dijk's research focusses on the regulation and function of sleep and its interaction with the circadian timing system in humans. [8] He examines how sleep, sleep regulation and circadian rhythms change across the lifespan and how sleep and circadian rhythms are affected by environmental factors such as natural and artificial light. [9]
Humans are sensitive to light with a short wavelength. Specifically, melanopsin is sensitive to blue light with a wavelength of approximately 480 nm. [19] The effect this wavelength of light has on melanopsin leads to physiological responses such as the suppression of melatonin production, increased alertness, and alterations to the circadian ...
One of the important questions in sleep research is clearly defining the sleep state. This problem arises because sleep was traditionally defined as a state of consciousness and not as a physiological state, [14] [15] thus there was no clear definition of what minimum set of events constitute sleep and distinguish it from other states of partial or no consciousness.
[A little insomnia is useful for appreciating sleep, for projecting some light into this night.]" Film-maker Alan Berliner made a documentary on his lifelong insomnia and its complex role in his creative process. [8] "Insomnia is almost an oasis in which those who have to think or suffer darkly take refuge." – Colette