Shift work sleep disorder (SWSD) occurs in individuals who work <u>nontraditional hours</u> like split shift, graveyard shifts, early morning shifts, or rotating shifts. It's characterized by <u>excessive sleepiness, lack of refreshing sleep, and drowsiness</u>. These symptoms can affect both work and leisure time. Both symptoms are predominant in SWSD. There are numerous shift work schedules, and they may be permanent, intermittent, or rotating; consequently, the manifestations of SWSD are quite variable. Shift working can disrupt what are known as circadian rhythms, the internal "body clock". This can disrupt the normal workings of a hormone called melatonin. This disruption can lead to poor sleep and chronic fatigue.
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