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Background: Disturbed sleep is prevalent in older adulthood and particularly among women. Greater psychological well-being (PWB) is associated with better sleep, but intraindividual variability in PWB has not been examined., Purpose: The current study examined whether mean levels and variability in PWB were associated with sleep disturbances in midlife and older women., Methods: Participants (N = 189) completed up to seven daily diaries and an end of the week assessment every 3 months for nine waves. Participants answered questions about their nightly sleep disturbances and reported their PWB using Ryff's six dimensions of PWB., Results: Regression models indicated that greater variability in one aspect of PWB, positive relations with others, was related to greater sleep disturbance even after adjusting for mean levels of well-being. Greater variability in environmental mastery, purpose in life, and self-acceptance were also associated with sleep disturbance, but these associations were no longer significant after adjusting for mean levels of well-being., Conclusions: Results suggest that fluctuations in positive relations with others are related to sleep in adult women above and beyond mean levels of well-being. Results highlight the importance of considering variability in addition to mean levels of PWB., (© Society of Behavioral Medicine 2020. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)

Objectives: The current study examined the factor structure of emotional experience across adults 34-50, 51-65, and 66-84 year olds., Method: Participants (N = 2,022) were asked about 14 negative and 13 positive emotions across 8 days in the National Study of Daily Experiences II study. Factor analysis computed both inter-individual factors (between-person structure of emotional experience) and intra-individual factors (factors describing emotions in daily life) for each age group., Results: For inter-individual variation, one positive and one negative factor captured emotions experienced for the first two age groups, but the 66 to 84-year-old adults had an additional factor for anger. For intra-individual variation, two factors (fear and sadness; anger) captured negative emotions for the first two age groups. The oldest age group had three negative factors: fear; anger (with additional sadness emotions); and sadness. Four factors captured positive emotions for the middle-aged groups and three for the oldest group; interpersonally oriented emotions (e.g. sense of belonging) were the primary sources of age differences., Discussion: Findings suggest that subtle age differences exist in the factor structure of daily emotional experience when comparing middle-aged and older adults., (© The Author(s) 2017. Published by Oxford University Press on behalf of The Gerontological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)