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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. [ 1][ 2] Increasingly, blue ...
Non-24-hour sleep–wake disorder causes a person's sleep–wake cycle to move around the clock every day, to a degree dependent on the length of the cycle. This is known as free-running sleep. [citation needed] People with the disorder may have an especially hard time adjusting to changes in "regular" sleep–wake cycles, such as vacations ...
There are three primary types of insomnia: sleep onset insomnia (difficulty falling asleep), sleep maintenance insomnia (difficulty staying asleep), and early waking, a subset of sleep maintenance ...
Rapid eye movement behavior disorder occurs when there is a loss of normal voluntary muscle atonia during REM sleep resulting in motor behavior in response to dream content. It can be caused by adverse reactions to certain drugs or during drug withdrawal; however, it is most often associated with the elderly and in those with neurodegenerative ...
Despite their popularity, blue light-blocking glasses probably don’t do much to reduce eyestrain, help keep people alert or improve sleep, according to a meta-analysis looking at 17 studies ...
If you need to go to bed sooner, try taking them earlier in the day. Conversely, you can take them later if you need to shift your clock to stay up later — but always consult your doctor first ...
Unlike REM sleep, there is usually little or no eye movement during these stages. Dreaming occurs during both sleep states, and muscles are not paralyzed as in REM sleep. People who do not go through the sleeping stages properly get stuck in NREM sleep, and because muscles are not paralyzed a person may be able to sleepwalk.
Here's how you can try the alpha bridge sleep hack to get a solid night's sleep. Get started by shutting your eyes and count to 30. Open your eyes just a bit and count to five. Repeat step #1 as ...