Sundown syndrome: a systematic review of the literature

The label sundown syndrome continues to be frequently used in long-term and acute care settings without consistent meaning. This study adds to the understanding of this label by synthesizing findings from research published since 1987 linked to sundown syndrome. The purpose of this systematic review is to describe, synthesize, and critique the theoretical definitions, operational definitions and measurement methods, prevalence, antecedent and precipitating factors and consequences, and effectiveness of interventions for sundown syndrome found in the published literature. Implications for research and practice are presented.