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Social defeat, resulting from the fight for a territory is based on the resident–intruder paradigm. A male rat intruder is placed in the territory of an older, bigger and more aggressive male resident and is defeated. In the present study, a double exposure to social defeat increased sleep fragmentation due to an increased amount of waking and slow-wave-sleep-1 (SWS-1) episodes. Also, social defeats...
The present study was done to determine whether weight gain was more prevalent in workers on late shifts than in those on day shifts. A questionnaire about changes in weight, food intake, exercise, and sleep since starting the job on the current shift was given to day-shift and late-shift (evening and night) hospital workers. Data were analyzed for 85 subjects, 36 of whom worked during the day shift...
Both genetic and environmental factors may be involved in the development of the increased sleep and appetite/body weight during winter, which are observed in seasonal affective disorder (SAD) as well as in normal variants of behavior in the general population. Decreases of these psychosomatic functions are also observed during summer, although the change may be less apparent than the winter changes...
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