Overall And Specific Relationships Between Inter-Individual Variations In Personality And Sleepwake Adaptability

The aim of this study was to evaluate the general and specific overlaps between the self-perceived traits of sleepwake adaptability and personality. The traits were assessed using multi-dimensional emic inventories, the 72-item SleepWake Pattern Assessment Questionnaire and the 148-word Spherical Cube Inventory of Personality Structure. Additionally, 130 of 265 respondents self-reported their sleep history and alertness/sleepiness in the course of total sleep deprivation. The results of the canonical correlation analysis indicated that a set of trait scorings in one domain significantly accounted for trait variation in another domain, but an amount of explained variance did not exceed 10%. The results of correlation and linear regression analyses suggested that lateness traits (chronotype) correlated more weakly with personality traits than either sleepability or wakeability traits (somnotype and trototype, respectively). We also proposed a theoretically grounded approach to classification, generalisation and explanation of the findings of numerous studies on personality correlates of chronotype.