@article {9406, title = {Personality and Sleep Quality: Evidence From Four Prospective Studies.}, journal = {Health Psychology}, volume = {37}, year = {2018}, pages = {271-281}, abstract = {Objective: The present study examined the longitudinal association between personality traits and sleep quality in 4 samples of middle-aged and older adults. Method: Participants (N > 22,000) were adults aged 30 to 107 years old from the Wisconsin Longitudinal Study (WLS), the Midlife in the United States Study (MIDUS), the Health and Retirement Study (HRS), and the Midlife in Japan Study (MIDJA). Personality and sleep quality were assessed at baseline and again 4 to 10 years later. Results: Scoring lower on neuroticism and higher on extraversion was associated with better sleep quality at baseline and over time, with effect sizes larger than those of demographic factors. Low conscientiousness was associated with a worsening of sleep quality over time. Openness and agreeableness were unrelated to sleep quality. Poor sleep quality at baseline was associated with steeper declines in extraversion, agreeableness, and conscientiousness and a smaller decrease in neuroticism over time. Conclusion: Replicable findings across samples support longitudinal associations between personality and sleep quality. This study identified specific personality traits that are associated with poor and worsening sleep quality, and substantiated previous findings that poor sleep quality is associated with detrimental personality trajectories.}, keywords = {Meta-analyses, Personality, Sleep}, issn = {0278-6133}, doi = {10.1037/hea0000577}, url = {http://doi.apa.org/getdoi.cfm?doi=10.1037/hea0000577http://psycnet.apa.org/psycarticles/2017-52631-001.pdf}, author = {Yannick Stephan and Angelina R Sutin and Bayard, Sophie and Kri{\v z}an, Zlatan and Antonio Terracciano} } @article {9079, title = {Subjective age and sleep in middle-aged and older adults.}, journal = {Psychology \& Health}, volume = {32}, year = {2017}, pages = {1140-1151}, abstract = {

OBJECTIVE: Chronological age is commonly used to explain change in sleep. The present study examines whether subjective age is associated with change in sleep difficulties across middle adulthood and old age.

DESIGN: Participants were drawn from the second (2004-2005) and third (2013-2014) waves of the Midlife in the United States Survey (MIDUS, N~=~2350; Mean Age: 55.54~years), the 2008 and 2014 waves of the Health and Retirement Study (HRS, N~=~4066; Mean Age: 67.59~years) and the first (2011) and fourth (2014) waves of the National Health and Aging Trends Survey (NHATS, N~=~3541; Mean Age: 76.46). In each sample, subjective age, sleep difficulties, depressive symptoms, anxiety and chronic conditions were assessed at baseline. Sleep difficulties was assessed again at follow-up.

MAIN OUTCOME MEASURES: Sleep difficulties.

RESULTS: An older subjective age at baseline was related to an increase in sleep difficulties over time in the three samples, and was mediated, in part, through more depressive symptoms, anxiety and chronic conditions. Feeling older was associated with an increased likelihood of major sleeping difficulties at follow-up in the three samples.

CONCLUSION: Subjective age is a salient marker of individuals{\textquoteright} at risk for poor sleep quality, beyond chronological age.

}, keywords = {Anxiety, Depressive symptoms, Sleep}, issn = {1476-8321}, doi = {10.1080/08870446.2017.1324971}, author = {Yannick Stephan and Angelina R Sutin and Bayard, Sophie and Antonio Terracciano} }