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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 waking up before the individual has slept enough. [ 1 ]
If one of the following laboratory methods is used, it must demonstrate a significant delay in the timing of the habitual sleep period: 1) 24-hour polysomnographic monitoring (or two consecutive nights of polysomnography and an intervening multiple sleep latency test), 2) Continuous temperature monitoring showing that the time of the absolute ...
A "dumb" ETD can be as simple as a red flag attached to the coupler on the last car of the train, whereas "smart" devices monitor functions such as brake line pressure and accidental separation of the train using a motion sensor, functions that were previously monitored by a crew in the caboose. [1]
A circadian rhythm is an entrainable, endogenous, biological activity that has a period of roughly twenty-four hours. This internal time-keeping mechanism is centralized in the suprachiasmatic nucleus (SCN) of humans, and allows for the internal physiological mechanisms underlying sleep and alertness to become synchronized to external environmental cues, like the light-dark cycle. [4]
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Waking up earlier in the morning increases the response. [11]Shift work: nurses working on morning shifts with very early awakening (between 4:00–5:30 a.m.) had a greater and prolonged cortisol awakening response than those on the late day shift (between 6:00–9:00 a.m.) or the night shift (between 11:00 a.m.–2:00 p.m.). [12]
The Fitbit Alta HR, a wearable device capable of monitoring a person's sleep. [1] Sleep tracking is the process of monitoring a person's sleep, most commonly through measuring inactivity and movement. [2] A device that tracks a person's sleep is called a sleep tracker. [3] Sleep tracking may be beneficial in diagnosing sleep disorders. [4]
Subsequent studies have confirmed these findings, explored the impact of school start times on the sleep needs and patterns of adolescents., [15] and demonstrated a "phase shift" in the release of melatonin at puberty, which appears to be involved in shifting the sleep-wake cycle several hours later during the adolescent years.