Objectives

To analyse simultaneously sleep habits and sleep disturbances in an elderly population and numerous factors possibly affecting sleep at the same time.

Design

A cross-sectional epidemiological survey by means of questionnaires.

Setting

The capital city of Iceland, Reykjavik and surrounding suburbs, Participants.

A randomly selected, but stratified sample with 100 men and 100 women in each 5-year age group of the ages 6 5-84 years-800 individuals altogether.