Failure to press the button in response to the stimulus (light) is recorded as an error, attributable to the microsleeps that occur as a product of sleep deprivation.Crucially, individuals subjective evaluations of their fatigue often do not predict actual performance on the PVT. While totally sleep-deprived individuals are usually aware of the degree of their impairment, lapses from chronic (lesser) sleep deprivation can build up over time so that they are equal in number and severity to the lapses occurring from total (acute) sleep deprivation. Chronically sleep-deprived people, however, continue to rate themselves considerably less impaired than totally sleep-deprived participants. Since people usually evaluate their capability on tasks like driving subjectively, their evaluations may lead them to the false conclusion that they can perform tasks that require constant attention when their abilities are in fact impaired. Mood
Sleep deprivation can have a negative impact on mood. Staying up all night or taking an unexpected night shift can make one feel irritable. Once one catches up on sleep, ones mood will often return to baseline or normal. Even partial sleep deprivation can have a significant impact on mood. In one study, subjects reported increased sleepiness, fatigue, confusion, tension, and total mood disturbance, which all recovered to their baseline after one to two full nights of sleep.Depression and sleep are in a bidirectional relationship. Poor sleep can lead to development of depression and depression can cause insomnia, hypersomnia, or obstructive sleep apnea. About 75% of adult patients with depression can present insomnia.
Pseudopelade of Brocq is a flesh- to pink-colored, irregularly shaped alopecia that may begin in a moth-eaten pattern with eventual coalescence into larger patches of alopecia. : 648 : 761

See also
Cicatricial alopecia
Louis-Anne-Jean Brocq
List of cutaneous conditions

References


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