Epidemiologists have published more than 50 studies of insomnia based on data collected
in various representative community-dwelling samples or populations. These surveys …

Nightmares are common, occurring weekly in 4%-10% of the population, and are associated
with female gender, younger age, increased stress, psychopathology, and dispositional …

The Pittsburgh Sleep Quality Index (PSQI) measures sleep quality and disturbance
retrospectively over a 1-month period using self-reports. Although the PSQI has been used …

Exercise Psychology, Second Edition, addresses the psychological and biological
consequences of exercise and physical activity and their subsequent effects on mood and …

Caffeine (particularly in the form of coffee) is one of the most widely consumed stimulants in
the world, with 90% of American adults consuming caffeine-infused beverages almost daily …

Objective: Since gender effect is inconsistent and grade effect has not been addressed in
previous studies, we investigated both effects on the daily sleep patterns in a group of young …

Abstract Study Objectives: Insomnia, a highly prevalent disorder with direct and indirect
economic and professional consequences, affects daytime functioning, behavior, and quality …

This study was an epidemiological questionnaire survey of a representative sample of the
French population that included 12 778 individuals and in which adapted DSM‐IV criteria for …

OBJECTIVE: Most research on the association between sleep disturbances and depression
has looked at cross-sectional data. The authors used two waves of data from a panel study …

This study, for the first time, distinguishes between nightmares and bad dreams, measures
the frequency of each using dream logs, and separately assesses the relation between …