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KMID : 0389519940010010047
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Sleep Medicine.Psychophysiology
1994 Volume.1 No. 1 p.47 ~ p.59
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A Comparision of Nighttime Sleepiness, Performance, and Body Temperature between Morning-Type and Evening-Type Persons
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Yoon Jin-Sang
Kook Seung-Hee
Shin Il-Seon
Shin Man-Sik
Choi Young
Lee Moo-Suk
Lee Hyung-Yung
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Abstract
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Objectives: The main purpose of this study was to investigate the possible differences in sleepiness, performance, and body temperature during the night between morning(M) and evening(E) type subjects.
Methods: After a survey study, to verify the validity and reliability of the Korean translation of the Home’ and Morningness-Eveningness Questionnaire(1976), 8 extreme M-type subjects(3males, 5 females) and 8 extreme E-type subjects(3 males, 5 females) were selected from the university student population who had participated in the survey study. All subjects underwent sleep latency test and a battery of performance tests at intervals of 2 hours through the night, from 23:00 to 07:00. Oral temperature of each subject was taken every hour from 21 : 00 to 8 : 00. Between the testing times, the experimenters ensured that subjects remained awake.
Results: More profound sleepiness was found in the M-type compared to the E-type throughout the night, with significant differences in sleepiness occuring at 23:00 and 01:00 hours. Overall performance efficiency tended to be lower through, the night in the M-type than in the E-type on all tests. A difference in time of temperature minimum between the two types was not noteworthy. Rather, there appeared to be a substantial difference in temperature level during the declining phase, with the temperature of the M-type being lower than that of the E-type.
Conclusions: These results indicate the existance of a temporal relationship between sleepiness, perfonnance and body temperature during night work. Since the M-type exhibited greater sleepiness and lower performance efficiency overnight than the E-type, it may be assumed that the E-type is more suitable for and tolerable to night work. There was some discussion of the limitations in generalizing these results together with some suggestions for future studies.
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KEYWORD
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Nighttime sleepiness, Performance, Body temperature, Morning type, Evening type, Night work
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