Examlex
It has been estimated by the National Institute of Mental Health that _______ of U.S. adults experience posttraumatic stress disorder during the course of any given year.
Sleep cycle
A period of sleep composed of multiple stages, including REM and non-REM stages, that repeats several times throughout a night's sleep.
NREM Stage
Non-Rapid Eye Movement sleep stage, which consists of three stages of sleep that precede REM sleep, characterized by slower brainwaves and physical relaxation.
REM
Rapid Eye Movement, a phase of sleep characterized by fast and random movement of the eyes, associated with dreaming.
Obstructive sleep apnea
A disorder characterized by repeated pauses in breathing during sleep due to throat muscles intermittently relaxing and blocking the airway.
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