Subjective age and sleep in middle-aged and older adults

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: 55.54years), the 2008 and 2014 waves of the Health and Retirement Study (HRS, N=4066; Mean Age: 67.59years) 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' at risk for poor sleep quality, beyond chronological age.