Abstract
Pre-sleep cognitive activity (PCA) is assumed to play a key role in sleep-onset insomnia. The present study aimed to develop a Pre-Sleep Cognitive Activity Scale (PCAS), and to investigate its reliability and validity. Data were collected from university students. Factor analysis of the data indicated that the Pre-Sleep Cognitive Activity Scale consisted of 3 factors: "negative thoughts and emotions," "anxiety about sleep-onset insomnia," and "worry about the influence of sleep-onset insomnia." Validity was confirmed by examining the correlation of the Pre-Sleep Cognitive Activity Scale with other measures. The reliability and validity of the Pre-Sleep Cognitive Activity Scale were acceptable.
