Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A period of sleep that lasts up to a few seconds, usually experienced by people who have narcolepsy or are severely deprived of sleep.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A brief period of sleep, usually of a few seconds, that may result from sleep deprivation or various medical conditions.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

micro- +‎ sleep

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Examples

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  • A lapse from wakefulness into sleep that lasts just a few seconds.

    May 13, 2008