Impact of Mandatory Wake Time on Sleep Timing, Sleep Quality and Rest-Activity Cycle in College and University Students Complaining of a Delayed Sleep Schedule: An Actigraphy Study.
ambulatory recordings
chronotype
circadian sleep disorders
delayed sleep-wake phase disorder
sleep schedule
social jetlag
Journal
Nature and science of sleep
ISSN: 1179-1608
Titre abrégé: Nat Sci Sleep
Pays: New Zealand
ID NLM: 101537767
Informations de publication
Date de publication:
2020
2020
Historique:
received:
23
03
2020
accepted:
27
05
2020
entrez:
3
7
2020
pubmed:
3
7
2020
medline:
3
7
2020
Statut:
epublish
Résumé
Individuals complaining of a delayed sleep schedule are expected to have shorter sleep duration and lower sleep quality when they must comply with morning obligations. The changes in the sleep schedule imposed by morning obligations may in turn decrease the stability and amplitude of their rest-activity cycle. These expectations were only partially supported in previous studies, possibly due to poor differentiation between days with mandatory or free wake times. Fourteen college/university students (8 women) with a complaint of a late sleep schedule and a bedtime after midnight were compared to fourteen controls with an earlier sleep schedule and no complaint. During a week of 24-h activity recording, participants specified in their sleep diary whether their wake time was free or determined by an obligation. The number of nights with mandatory wake times was similar in the two groups. Groups were also similar for sleep duration and sleep quality over the 7 days of recording. Actigraphic sleep efficiency was the same in the two groups for both free and mandatory wake times, but subjective sleep quality decreased on the nights with mandatory wake time in both groups. On the nights with mandatory wake time, delayed participants had shorter sleep episodes and less total sleep time than controls. Rest-activity cycle amplitude was lower in the delayed group whether wake time was free or mandatory. Sleep duration and total sleep time differed between the two groups only when wake time was mandatory. Prior to mandatory wake times, delayed participants kept the same bedtime and shortened their sleep; sleep latency and sleep efficiency were preserved but subjective sleep quality and alertness on awakening decreased compared to nights with free wake time. Lower amplitude of the rest-activity cycle in delayed subjects may reflect lifestyle differences compared to control participants.
Sections du résumé
BACKGROUND
BACKGROUND
Individuals complaining of a delayed sleep schedule are expected to have shorter sleep duration and lower sleep quality when they must comply with morning obligations. The changes in the sleep schedule imposed by morning obligations may in turn decrease the stability and amplitude of their rest-activity cycle. These expectations were only partially supported in previous studies, possibly due to poor differentiation between days with mandatory or free wake times.
PARTICIPANTS
METHODS
Fourteen college/university students (8 women) with a complaint of a late sleep schedule and a bedtime after midnight were compared to fourteen controls with an earlier sleep schedule and no complaint.
METHODS
METHODS
During a week of 24-h activity recording, participants specified in their sleep diary whether their wake time was free or determined by an obligation.
RESULTS
RESULTS
The number of nights with mandatory wake times was similar in the two groups. Groups were also similar for sleep duration and sleep quality over the 7 days of recording. Actigraphic sleep efficiency was the same in the two groups for both free and mandatory wake times, but subjective sleep quality decreased on the nights with mandatory wake time in both groups. On the nights with mandatory wake time, delayed participants had shorter sleep episodes and less total sleep time than controls. Rest-activity cycle amplitude was lower in the delayed group whether wake time was free or mandatory.
CONCLUSION
CONCLUSIONS
Sleep duration and total sleep time differed between the two groups only when wake time was mandatory. Prior to mandatory wake times, delayed participants kept the same bedtime and shortened their sleep; sleep latency and sleep efficiency were preserved but subjective sleep quality and alertness on awakening decreased compared to nights with free wake time. Lower amplitude of the rest-activity cycle in delayed subjects may reflect lifestyle differences compared to control participants.
Identifiants
pubmed: 32612401
doi: 10.2147/NSS.S251743
pii: 251743
pmc: PMC7323815
doi:
Types de publication
Journal Article
Langues
eng
Pagination
365-375Informations de copyright
© 2020 Moderie et al.
Déclaration de conflit d'intérêts
Ms Solenne Van der Maren reports Student Fellowship from Natural Sciences and Engineering Research Council of Canada (NSERC), during the conduct of the study. Professor Marie Dumont reports grants from Natural Sciences and Engineering Research Council of Canada (NSERC), during the conduct of the study. The authors report no other conflicts of interest in this work.
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