Purpose: This study aims to 1) determine the age-specific and sex-specific prevalence rates of different types of insomnia (i.e., difficulty initiating sleep, difficulty maintaining sleep, early morning awakening, and nonrestorative sleep) in Taiwanese general population, 2) examine the correlates of sleep quality and excessive daytime sleepiness in Taiwanese general population, and 3) compare the differences in demographic variables, anthropometric data, sleep quality, daytime sleepiness, and personal perception of life among different insomnia groups.

Method: This study will analyze data from the 2005 Survey of Social Development Trends ---Health Security conducted by the Directorate-General of Budget, Accounting and Statistics, Executive Yuan, Taiwan. The target population was men and women aged 15 and above, resided in any one of the 23 counties or cities in Taiwan. This survey utilized is a cross-sectional study that utilized a two-staged stratified systematic sampling scheme. A total of 36,743 individuals were included in the survey. Data from the 2005 Survey of Social Development Trends ---Health Security will be recoded and variables will be redefined according to the specific aims of the current study. Descriptive analyses, correlational analyses, Analysis of Variance, Chi-Square, and Fisher's Exact tests will be used to examine the study aims.

Expected outcome: Data from this current analysis will provide insights into the insomnia epidemic in Taiwanese general population.