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A period of attention loss and unresponsiveness that lasts from a few seconds to a few minutes and is often not associated with other characteristics of sleep, such as closed eyes or the perception of having been unconscious. Microsleeps are usually experienced by people who have narcolepsy or are severely deprived of sleep.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Physiology) a period of sleep which is so momentary as to be imperceptible
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014