noun Psychology.

a moment of sleep followed by disorientation, experienced especially by persons suffering from narcolepsy or sleep deprivation.

Origin of microsleep

First recorded in 1940–45; micro- + sleep
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for microsleep

intermission, pause, nod, catnap, spot, rest, interlude, break, doze, respite, shuteye, siesta, snooze

British Dictionary definitions for microsleep



a period of sleep which is so momentary as to be imperceptible
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012