Loneliness, perceived isolation and sleep quality in later life. Longitudinal evidence from a population-based German study

OBJECTIVES: To date, there is restricted knowledge regarding the association between loneliness, perceived social isolation and sleep quality based on longitudinal studies. Our aim was therefore to clarify the association between loneliness, perceived social isolation and sleep quality stratified by sex using a longitudinal approach.

METHODS: Longitudinal data (wave 5 and wave 6) were used from a nationally representative sample of community-dwelling individuals ≥ 40 years in Germany. In our analytical sample, n equaled 8784 observations. The Bude and Lantermann tool was used to quantify perceived social isolation and the De Jong Gierveld tool was used to measure loneliness. Relying on key items of the Pittsburgh Sleep Quality Index, sleep quality was assessed.

RESULTS: Increases in loneliness were associated with worsening sleep quality (in men: in two outcomes; in women: in all three outcomes). Moreover, in men, increases in perceived social isolation was associated with decreases in overall sleep quality (β = 0.10, p < 0.01), but not with the other outcomes. In contrast, perceived social isolation was not associated with changes in any of the outcome measures in women.

CONCLUSIONS: Increases in loneliness were particularly associated with worsening sleep quality among women, whereas the overall sleep quality decreases when perceived social isolation increases in men. Efforts to reduce perceived social isolation (men) and loneliness (in men, but particularly in women) can contribute to sleep quality in individuals aged 40 years and over in Germany.