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orthodox sleep

American  

noun

Physiology.

  1. dreamless sleep, characterized by a slow alpha rhythm of brain waves and no marked physiological changes.

Etymology

Origin of orthodox sleep

First recorded in 1965–70

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.