0799 MORNINGNESS-EVENINGNESS TENDENCY AND SLEEP ARCHITECTURE OF AFTERNOON NAPS IN UNIVERSITY STUDENTS IN UNIVERSITY STUDENTS

Abstract

The aim of this study was to investigate the effects of morningness-eveningness tendency on the sleep architecture of afternoon naps in university students after adjustments for sex, body mass index, nighttime total sleep time, caffeine consumption habits. This study had a cross-sectional descriptive correlational design. Polysomnography was used to record the sleep architecture of 52 students invited to take an afternoon nap in the laboratory. Two questionnaires were used to collect their sleep-related information. The morningness-eveningness questionnaire evaluated the morningness-eveningness tendency. Daily sleep diary collected individual’s sleeping and waking times during the prior week. After adjustments for potential factors, the non-morning tendency (non-MT) participants had significantly shorter sleep onset latency during nap than did the morning tendency (MT) participants with. We observed that among non-MT participants, students with short nocturnal sleep duration in previous day had significantly longer percentage of slow wave sleep and rapid eye movement in naps; and the difference was not found among MT participants. This study was the first to examine the association between the morningness-eveningness tendency and sleep architecture of afternoon naps in young adults. This study suggests that compared to participants with MT, the sleep architecture of nap in non-MT participants was affected by previous nocturnal sleep, and they are more likely to fall asleep during naps. NA