Sleep disturbances and depression in the elderly in Japan.

Unlabelled: The purpose of the present study was to evaluate the relationship between sleep disturbances and depression in the Japanese elderly.

Methods: These investigations in the Japanese elderly were carried out with the Geriatric Depression Scale, the Pittsburgh Sleep Quality Index, and questions on restless legs syndrome and nocturnal eating disorder. A total of 2023 people (male: 1008; female: 1015; average age: 74.