Abstract
The authors conducted sleep time monitoring using an activity-detecting device on a married couple. The subjects were a 39-year-old man and a 36-year-old woman. They were continuously monitored for 1 year or a half-year from 1998 to 1999. Their daily activities were not limited. The male works in an office 5 days a week and stays at home on weekends. The female is a farmer and works in the field when the weather is clear. They usually went to bed at 10–11 p.m. and got up around 6 a.m. the next morning on weekdays. The activity-monitoring device, Actiwatch®, was installed on the wrists of their non-dominant arms. The number of body movements was calculated by the summation of the active electricity number. There was no significant monthly difference in the mean nightly total sleep time (TST) by analysis of variance in either the husband or the wife. When nocturnal and diurnal sleep were combined for the analysis, the mean value in April or May, 1999, was significantly larger than the values in July, August, December or October, although only in the husband. The sleep time for Saturday or Sunday was significantly extended as compared to that of a weekday. Power spectrum analysis showed the TST cycle to predominate on all 7 days in the week in both subjects.
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