Effect of delayed sleep phase during university life on the daytime functioning in work life after graduation

Shoichi Asaoka; Yoko Komada; Sayaka Aritake; Yuko Morita; Kazuhiko Fukuda; Yuichi Inoue

doi:10.1016/j.sleep.2014.05.017

Effect of delayed sleep phase during university life on the daytime functioning in work life after graduation

Sleep Med. 2014 Sep;15(9):1155-8. doi: 10.1016/j.sleep.2014.05.017. Epub 2014 Jun 11.

Authors

Shoichi Asaoka¹, Yoko Komada², Sayaka Aritake³, Yuko Morita², Kazuhiko Fukuda⁴, Yuichi Inoue²

Affiliations

¹ Department of Psychology and Humanities, Edogawa University, Nagareyama, Chiba, Japan; Sleep Research Institute, Edogawa University, Nagareyama, Chiba, Japan. Electronic address: [email protected].
² Department of Somnology, Tokyo Medical University, Shinjuku, Tokyo, Japan; Japan Somnology Center, Neuropsychiatric Research Institute, Shibuya, Tokyo, Japan.
³ School of Sport Sciences, Waseda University, Tokorozawa, Saitama, Japan.
⁴ Department of Psychology and Humanities, Edogawa University, Nagareyama, Chiba, Japan; Sleep Research Institute, Edogawa University, Nagareyama, Chiba, Japan.

PMID: 25091532
DOI: 10.1016/j.sleep.2014.05.017

Abstract

Objective: To examine the effects of changes in sleep phase on the daytime functioning of new university graduates.

Methods: Questionnaire data of university students (n = 745) and university graduates working full time (n = 360) were analyzed to explore sleep phase changes during this life stage. The newly graduated full-time workers (n = 117) were divided into 2 (bedtime at investigation: earlier/later) × 2 groups (bedtime at one year prior to investigation: earlier/later), and depressive symptoms and health-related quality of life were compared among groups.

Results: New university graduates experienced ~1 h of sleep phase advancement and shortened time in bed compared to one year before investigation. In addition, those who experienced such sleep changes showed larger daytime dysfunction.

Conclusion: Prevention of extreme sleep phase delay during university days might be helpful for students' adaptation to work environment after graduation.

Keywords: Delayed sleep phase; Depressive symptom; Full-time workers; New university graduate; Quality of life; University students.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Adult
Cross-Sectional Studies
Depressive Disorder / diagnosis
Depressive Disorder / psychology
Disorders of Excessive Somnolence / diagnosis*
Disorders of Excessive Somnolence / psychology
Employee Performance Appraisal*
Female
Health Surveys
Humans
Japan
Longitudinal Studies
Male
Quality of Life / psychology
Risk Factors
Sleep Deprivation / diagnosis
Sleep Deprivation / psychology
Sleep Disorders, Circadian Rhythm / diagnosis*
Sleep Disorders, Circadian Rhythm / psychology
Students*
Surveys and Questionnaires
Young Adult