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NREM sleep
Also known as: NREM sleep, non-REM sleep, NREM sleep stages
Facts (25)
Sources
Short- and long-term health consequences of sleep disruption dovepress.com May 19, 2017 6 facts
claimBrain activity decreases from wakefulness during NREM sleep, whereas during REM sleep, brain activity levels are similar to wakefulness, except for increases in motor and sensory areas.
claimComparing the historical four-stage sleep classification system with the American Academy of Sleep Medicine's three-stage system shows only minor differences in total sleep time, sleep efficiency, and REM sleep, but the choice of system impacts the measurement of wake after sleep onset and the distribution of NREM sleep stages.
claimThe American Academy of Sleep Medicine developed a newer sleep classification system that categorizes NREM sleep into three stages: lighter sleep (Stages N1 and N2) and deeper sleep or slow-wave sleep (Stage N3).
claimDuring the night, neurons in the pons switch between NREM and REM sleep by sending outputs to the brain stem and spinal cord (causing muscle atonia and chaotic autonomic activity), the forebrain, and the thalamus via cholinergic pathways.
claimDuring NREM sleep, heart rate, blood pressure, blood flow to the brain, and respiration are decreased compared with wakeful periods.
claimHistorically, sleep has been divided into one stage of rapid eye movement (REM) sleep and four stages (Stages 1–4) of non-rapid eye movement (NREM) sleep, characterized by increasing sleep depth.
Extent and Health Consequences of Chronic Sleep Loss and ... - NCBI ncbi.nlm.nih.gov 5 facts
claimDepressed patients exhibit hypermetabolism in the brain's emotional pathways, including the amygdala, anterior cingulate cortex, and related structures, during both waking and NREM sleep.
claimPrimary parasomnias are classified based on the sleep state in which they originate, such as REM sleep, NREM sleep, or states that can occur during either.
measurementWhen transitioning from waking to non-REM (NREM) sleep, depressed subjects show smaller decreases in relative metabolism in regions of the frontal, parietal, and temporal cortex compared to healthy individuals, according to Nofzinger et al. (2005) using positron emission tomography.
referenceNofzinger et al. (2005) documented alterations in regional cerebral glucose metabolism across waking and non-rapid eye movement sleep in patients with depression.
claimDisorders of arousal typically occur during the first 60 to 90 minutes of sleep and involve partial arousal from deep NREM sleep rather than full awakenings.
The Profound Interplay Between Sleep and Cognitive Function creyos.com Aug 14, 2025 4 facts
referenceSleep cycles through two primary states: non-rapid eye movement (NREM) sleep and rapid eye movement (REM) sleep, each playing a distinct role in memory consolidation and cognitive processes.
referenceNREM sleep supports the consolidation of procedural memory, which includes the learning of skills and habits such as riding a bike or playing an instrument, as reported by Christova et al. (2018).
referenceSleep spindles, which are short neural oscillations that occur during NREM sleep, have been consistently linked to cognitive performance (Bódizs et al., 2014).
claimThe deepest stage of NREM sleep, known as N3 or slow-wave sleep, is crucial for memory consolidation.
Conflicting States of Consciousness: Exploring Psilocin and Sleep psychedelicreview.com May 25, 2022 3 facts
claimMice cycle through distinct stages of wakefulness, non-rapid eye movement (NREM) sleep, and rapid eye movement (REM) sleep, similar to humans.
claimNon-rapid eye movement (NREM) sleep is characterized by slow-wave activity, which consists of low-frequency, high-amplitude EEG signals reflecting slow, synchronized brain activity.
measurementIn the three hours following a psilocin injection, mice spent more time awake and less time in NREM or REM sleep.
Benefits of Sleep: Improved Energy, Mood, and Brain Health sleepfoundation.org Jul 22, 2025 2 facts
claimNon-REM sleep is important for physical repair and immune function, while REM sleep supports memory consolidation, learning, and emotional regulation.
claimSleep is a complex biological process composed of several stages that cycle throughout the night, including rapid eye movement (REM) sleep and non-REM sleep.
Exploring “lucid sleep” and altered states of consciousness using ... philosophymindscience.org Jan 7, 2025 2 facts
referenceParker (2019) discusses the yogic practice of yoga-nidrā as a method for training attention during conscious non-REM sleep and explores its implications for neuroscience research.
claimPhenomenological analysis in the case series study indicated that lucid sleep episodes occurred during both REM and non-REM sleep.
The New Field of Network Physiology: Building the Human ... frontiersin.org 1 fact
claimLioi et al. (2017) show that directional connectivity in the electroencephalogram (EEG) can discriminate between wakefulness and non-rapid eye movement (NREM) sleep.
Why Is Sleep Important for Our Mental and Physical Health? insightspsychology.org Oct 29, 2024 1 fact
claimStage 1 NREM (Non-Rapid Eye Movement) sleep is the transition phase from wakefulness to sleep characterized by body relaxation and slowing brain waves.
A Synergistic Workspace for Human Consciousness Revealed by ... elifesciences.org 1 fact
referenceThe study 'Discovery of key whole-brain transitions and dynamics during human wakefulness and non-REM sleep' was published in Nature Communications (volume 10).