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Circadian rhythm sleep disorders (CRSD), also known as circadian rhythm sleep–wake disorders (CRSWD), are a family of sleep disorders that affect the timing of sleep. CRSDs cause a persistent pattern of sleep/wake disturbances that arise either by dysfunction in one's biological clock system, or by misalignment between one's endogenous oscillator and externally imposed cues.
Shift work sleep disorder (SWSD) is a circadian rhythm sleep disorder characterized by insomnia, excessive sleepiness, or both affecting people whose work hours overlap with the typical sleep period. Insomnia can be the difficulty to fall asleep or to wake up before the individual has slept enough. [ 1 ]
There has also been research into the utility of the individual components of CBT-I, when delivered as monotherapies or multi-component therapies without cognitive therapy. A 2023 systematic review [39] demonstrated that just stimulus control and sleep restriction are effective treatment options for insomnia in older adults. It also indicated ...
Light therapy, which involves a bright light exposure of thousands of lux of white light or about 400 lux of blue light on awakening to counteract the tendency for circadian rhythms to delay (similar to treatment for delayed sleep phase disorder [6] and seasonal affective disorder), is not currently recommended until more studies appear ...
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.
“Similar symptoms can occasionally be seen in older adults without dementia, ... “Encourage activities and exposure to natural light during the day to support healthy sleep-wake cycles.” ...
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