Sleep, non-rapid eye movement
NREM (non-rapid eye movement) sleep is dreamless sleep. During NREM, the brain waves on the electroencephalographic (EEG) recording are typically slow and of high voltage, the breathing and heart rate are slow and regular, the blood pressure is low, and the sleeper is relatively still. NREM sleep is divided into 4 stages of increasing depth leading to REM sleep. REM sleep is when dreams occur. We have 3 to 5 REM periods per night. They occur at intervals of 1-2 hours apart and are quite variable in length, ranging from 5 minutes to over an hour. REM sleep is characterized by rapid, low-voltage brain waves, irregular breathing and heart rate and involuntary muscle jerks.

Medical dictionary. 2011.

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  • Non-rapid eye movement sleep — slow eyes redirects here. For sloe eyes, see Prunus spinosa. Non rapid eye movement, or NREM is, collectively, sleep stages 1 – 3, previously known as stages 1 – 4. Rapid eye movement sleep (REM) is not included. There are distinct… …   Wikipedia

  • Non-rapid eye movement sleep — NREM (non rapid eye movement) sleep is dreamless sleep. During NREM, the brain waves on the electroencephalographic (EEG) recording are typically slow and of high voltage, the breathing and heart rate are slow and regular, the blood pressure is… …   Medical dictionary

  • Rapid eye movement (sleep) — Rapid eye movement (REM) sleep is a normal stage of sleep characterized by rapid movements of the eyes. REM sleep is classified into two categories: tonic and phasic. [cite book|author=Kryger M, Roth T, Dement W|title=Principles amp; Pracitces of …   Wikipedia

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