Shift Work Sleep Disorder
Shift work sleep disorder consists of symptoms of insomnia or excessive sleepiness that
occur as a transient phenomena in relation to work schedules.
The work is usually scheduled during the habitual hours of sleep, roster work, or
irregular work hours. The sleep complaint typically consists of an inability to maintain a
normal sleep duration when the major sleep episode is begun in the morning (6 A.M. to 8
A.M.) after a night shift. The reduction in sleep normally amounts to one to four hours.
Excessive sleepiness usually occurs during shifts (mainly night) and is associated with
the need to nap and impaired mental ability because of the reduced alertness.
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