Medical Subject Headings

Last uploaded: March 22, 2026
Id http://purl.bioontology.org/ontology/MESH/D012894
http://purl.bioontology.org/ontology/MESH/D012894
Preferred Name

Sleep Stages

Definitions
Periods of sleep manifested by changes in EEG activity and certain behavioral correlates; they formerly included Stage 1: sleep onset, drowsy sleep; Stage 2: light sleep; Stages 3 and 4: delta sleep, light sleep, deep sleep, telencephalic sleep. In 2007, sleep stages were redefined by The American Academy of Sleep Medicine (AASM) as: N1-N2 (sleep onset - light sleep), N3 (SLOW-WAVE SLEEP), and REM SLEEP.
Synonyms
NREM Stage 2
N2 Sleep
N1-Sleep
NREM Stage 1
Sleep Stage
N1 Sleep
N2-Sleep
Stage, Sleep
Stages, Sleep
Type http://www.w3.org/2002/07/owl#Class
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