title: The impact of increasing sleep restriction on cortisol and daytime sleepiness in adolescents.
abstract: Sleep restriction is a widespread phenomenon, specifically in adolescents. This study investigated the impact of increasing sleep restriction in adolescents on cortisol levels and daytime sleepiness. Eighty-eight healthy adolescents were randomized to five sleep restriction protocols (four consecutive nights with 9, 8, 7, 6, or 5 h time in bed). Polysomnography (baseline and last experimental night) and multiple sleep latency test (day 6) data were obtained. Saliva cortisol levels were assessed half-hourly in the evening before and in the morning after the baseline and the last experimental night. Four nights of sleep restriction in healthy adolescents lead to a linear increase of objective sleepiness, but had no significant effect on evening or morning cortisol levels. The lack of detrimental effects of sleep restriction on cortisol levels might be due to compensation mechanisms during sleep.
authors.affiliation: Department of Psychiatry and Psychotherapy, University Medical Center Freiburg, Germany. UVoderholzer@Schoen-Kliniken.de
authors.forename: Ulrich
authors.initials: U
authors.lastname: Voderholzer
authors.forename: Hannah
authors.initials: H
authors.lastname: Piosczyk
authors.forename: Johannes
authors.initials: J
authors.lastname: Holz
authors.forename: Bernd
authors.initials: B
authors.lastname: Feige
authors.forename: Barbara
authors.initials: B
authors.lastname: Loessl
authors.forename: Marta
authors.initials: M
authors.lastname: Kopasz
authors.forename: Dieter
authors.initials: D
authors.lastname: Riemann
authors.forename: Christoph
authors.initials: C
authors.lastname: Nissen
mesh_terms: D000293:Adolescent; D005260:Female; D006801:Humans; D006854:Hydrocortisone / Q000032:analysis / Q000378:metabolism*; D007118:Immunoassay; D008163:Luminescent Measurements; D008297:Male; D017286:Polysomnography; D012463:Saliva / Q000737:chemistry; D012892:Sleep Deprivation / Q000378:metabolism*
chemical_list: D006854:Hydrocortisone