The daily diary method was used to examine the daily dynamics of adolescent sleep time, activities, and psychological well-being among an ethnically diverse sample of over 750 adolescents approximately 14-15 years of age. Studying and stressful demands during the day were modestly but consistently associated with less sleep that evening. Receiving less sleep at night, in turn, was modestly but consistently related to higher levels of anxiety, depressive feelings, and fatigue during the following day. In addition, the daily variability in adolescents' sleep time was notable and just as important for the youths' average levels of daily psychological well-being as was the average amount of time spent sleeping each night. A small number of ethnic and gender differences emerged in the dynamics of adolescent sleep, activities, and well-being. Discussion focuses on the importance of examining variability in adolescents' sleep behaviors in order to better understand the implications of sleep for adolescent well-being and development.

Multiple dimensions of adolescents' connectedness with their families were investigated among 489 9th-grade students (M = 14.86 years) from families with Mexican, Chinese, and European backgrounds. Participants reported on various aspects of their family relationships and completed diary checklists of daily behaviors for a 2-week period. Adolescents from European backgrounds reported levels of family identification and dyadic closeness with parents similar to or greater than those reported by their peers. For adolescents from Mexican and Chinese backgrounds, particularly those from immigrant families, family connectedness included a stronger emphasis on family obligation and assistance. The extent to which family demographic variables, including parental level of education and residence in a single-parent family, accounted for group differences was examined.

The purpose of this study was to assess the comorbidity between chronic pain and posttraumatic stress disorder (PTSD) and examine the extent to which PTSD is associated with changes in the multidimensional experience of pain in a sample of Veterans with chronic pain. It was hypothesized that Veterans with comorbid chronic pain and PTSD would report significantly higher scores on measures of pain intensity, pain behaviors, pain-related disability, and affective distress than Veterans with pain alone. Data were obtained from 149 Veterans who completed self-report questionnaires as part of their participation in a Psychology Pain Management program at a northeastern Department of Veterans Affairs health care facility. Analyses indicated that 49% of the sample met criteria for PTSD. A multivariate analysis of covariance was conducted with age, sex, pain duration, and depressive symptom severity as covariates. In partial support of our hypothesis, the presence of PTSD was found to contribute significantly to measures of affective distress, even after controlling for the effects of depressive symptom severity. The implications of these data are discussed.

This paper tries to make three points. First, current constructs in personality and psychopathology are based on the restrictive evidence contained in self-reports. As a result, heterogeneous categories of individuals are assigned to the same category. Second, it is suggested that when different sources of evidence are included, theoretically distinct groups will be detected within the prior heterogeneous category. Third, the authors argue that physiological information has the potential to parse individuals with similar phenotypes on self-report data into distinct groups that reveal the temperamental origins of their phenotype.

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