A microsleep (MS) is a temporary episode of sleep which may last for a fraction of a second or up to thirty seconds where an individual fails to respond to some arbitrary sensory input. MSs occur when an individual loses awareness and subsequently gains awareness after a brief lapse in consciousness, or when there are sudden shifts between states ...
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http://en.wikipedia.org/wiki/Microsleep
(from the article `sleep`) ...time not of his own choice) tend to be affected more adversely than tasks that are self-paced. Errors of omission are common with the former kind ...
Found on
http://www.britannica.com/eb/a-z/m/86
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