A survey of junior high school students' sleep habit and lifestyle in Okinawa.

A survey was made of the sleep and lifestyle activity patterns of 3754 students from 14 different junior high schools on Okinawa Island. The survey showed that bedtimes became progressively and significantly later as students ascended to higher grades, resulting in adolescent sleep debt. The later adolescents retired to sleep, there appeared significantly greater numbers suffering from insufficient sleep, who found difficulty in waking up, who arose later in the mornings, and who failed to eat breakfast.

Effects of short nap and exercise on elderly people having difficulty in sleeping.

The purpose of the present study was to examine the effects of short nap and exercise on the sleep quality of elderly people who reported difficulty in sleeping. 'Interventions' such as short nap after lunch and moderate-intensity exercise in the evening were carried out for 4 weeks. After the 'interventions', wake time after sleep onset significantly decreased and sleep efficiency significantly increased, which showed that sleep quality was improved.

Survey of sleep-health and lifestyle of the elderly in Okinawa.

A total of 788 people (aged from 60 to 93 years) living in the Okinawa prefecture, renowned for the long life expectancy of its citizens, were randomly chosen as subjects. A questionnaire based on lifestyle and sleep-health was distributed. Following this, subjects were chosen in groups of nine from the good sleep-health group and then from the poor sleep-health group based on the results of the survey; their physical activities were then recorded using actigraphs for 1 week.

Effects of Hemerocallis on sleep in mice.

Freeze-dried flowers of the Akinowasuregusa (Hemerocallis fulva L. var. sempervirona M.