Journal
PSYCHIATRY AND CLINICAL NEUROSCIENCES
Volume 54, Issue 3, Pages 361-362Publisher
BLACKWELL SCIENCE ASIA
DOI: 10.1046/j.1440-1819.2000.00715.x
Keywords
Antarctica; circadian rhythm; light; seasonal variation; sleep-wake rhythm
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The subjects were eight men of the Japanese Antarctic Research Expedition (average age 35.8 years), and 10 healthy people living around Kofu, Japan (28.9 years). They completed a sleep log for 12 to 18 months, and the sleep-wake state was scored in 10-min epochs. Q(24) values calculated by chi (2) periodgram were low in the Antarctic midwinter. This means that there was difficulty in synchronizing to a 24-h period in the Antarctic midwinter. In Antarctica, sleep onset and offset times were delayed mostly in the midwinter. In Japan, sleep offset time was delayed mostly around the winter solstice.
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