Sleep disturbance affects all aspects of mental and physical functioning and quality of life and may lead to or worsen Alzheimer’s disease. Sleep disturbances in people with dementia living at home predicts care home admission and carer distress. Estimates of the prevalence of sleep disturbance vary, and it is unclear how prevalence rates differ according to setting. We conducted the first systematic review and meta-analysis on the prevalence of sleep disturbances in people living with dementia in the community. We aimed to examine demographic predictors and whether overall prevalence has changed over time.

We searched Embase, MEDLINE and PsycINFO for studies reporting the prevalence of sleep disturbances in people with dementia living at home. We meta-analysed data and calculated the pooled prevalence of sleep disturbances in people with dementia overall and in dementia subtypes. We used meta-regressions to investigate the effects of study characteristics, publication dates and participant demographics.

Eleven studies fulfilled the inclusion criteria. The pooled prevalence of any symptoms of sleep disturbance was 26% (95% confidence intervals (CI): 23-30%; n= 2719) and of clinically significant sleep disturbance 19% (95% CI: 13-25%; n= 2753). The pooled prevalence of sleep disturbance symptoms was significantly lower among people with Alzheimer’s disease (24%; 95% CI: 16-33%, n=310) than Lewy body dementia (49%; 95% CI: 37-61%, n=65). Meta-regression analysis did not find that publication year, participant’s age, sex and study quality predicted prevalence.

Sleep disturbances are common among people with dementia living in the community, especially in Lewy body dementia. There was no change in prevalence according to publication dates (between 2002 and 2018). This suggests that possible advances in treatment of sleep disturbance are not reflected in improvements for people living with dementia. This highlights the need to develop effective intervention strategies, reducing the prevalence of sleep disturbances in people living with dementia living at home in the community.