@prefix n9j: <http://data.loterre.fr/ark:/67375/N9J> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix isothes: <http://purl.org/iso25964/skos-thes#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .

n9j:-F3DHF5GQ-4
  skos:prefLabel "sleep stages"@en ;
  a skos:Concept ;
  skos:narrower n9j:-Z5Q7XBBV-C .

n9j:-concepts
  a isothes:ConceptGroup ;
  skos:prefLabel "concepts"@en ;
  skos:member n9j:-Z5Q7XBBV-C .

n9j: a skos:ConceptScheme .
n9j:-Z5Q7XBBV-C
  owl:sameAs <https://concepts.sagepub.com/social-science/concept/REM_sleep> ;
  skos:definition "The terms rapid eye movement (REM) and nonrapid eye movement (NREM) were first coined by William Dement in the 1950s; he went on to become a leader in the field of sleep research. REM sleep occurs in the fifth stage of sleep and is associated with dreaming. [Source: The SAGE Glossary of the Social and Behavioral Sciences; REM Sleep]"@en ;
  a skos:Concept ;
  skos:inScheme n9j: ;
  skos:broader n9j:-F3DHF5GQ-4 ;
  skos:prefLabel "REM sleep"@en ;
  skos:exactMatch <https://id.nlm.nih.gov/mesh/D012895.html> .