microsleep

[ mahy-kroh-sleep ]
/ ˈmaɪ kroʊˌslip /

noun Psychology.

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

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Origin of microsleep

First recorded in 1940–45; micro- + sleep
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for microsleep

microsleep
/ (ˈmaɪkrəʊˌsliːp) /

noun

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