J Korean Neuropsychiatr Assoc.  2012 Jul;51(4):218-224.

Sleep Wake Patterns and Nocturnal Sleep Parameters in the Morning and Evening Types

• Jang KH
• Kim SJ
• Lee SY
• Lee JH

Abstract

OBJECTIVES
The aim of our study was to compare sleep wake patterns and nocturnal sleep parameters between the morning type (MT) and evening type (ET).
METHODS
The Morningness-Eveningness Questionnaire, Pittsburgh Sleep Quality Index (PSQI), and Korean version of the Epworth Sleepiness Scale (KESS) were administered to subjects recruited among visitors to the Chuncheon National Museum from 2010 to 2011. Actigraphy data (Actiwatch-2, Philips-Respironics Co.) were collected from eight MT (Age 38.0+/-3.8, M : F=2 : 6), 12 neither type (NT) (Age 34.2+/-5.1, M : F=2 : 10), and nine ET (Age 30.3+/-6.8, M : F=2 : 7) subjects.
RESULTS
Scores for PSQI and KESS did not differ significantly among the MT, NT, and ET groups. No differences in time in bed, total sleep time, sleep efficiency, wake after sleep onset, sleep latency, and fragmentation index were observed among the three groups. In the ET group, the mean wake time on free days was significantly later, and the mean sleep duration on free days was significantly longer, compared with those of the MT group (p<0.01).
CONCLUSION
No differences in sleep quality, daytime sleepiness, and nocturnal sleep parameters were observed among the MT, NT, and ET groups. Compared to MT subjects, ET subjects showed later wake time and longer sleep duration on free days.

Keyword

Morningness-eveningness; MEQ; Sleep wake pattern; Sleep parameter; Actigraphy

MeSH Terms

Actigraphy
Museums
Surveys and Questionnaires

Figure

• 

  Fig. 1 Pearson's correlation analysis of PSQI scores with WASO (p<0.05), PSQI : Pittsburgh Sleep Quality Index, WASO : Wake time after sleep onset.

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