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SummaryDelirium has been associated with institutionalization, increased length of hospital stay, cognitive and functional decline and mortality. Research in the last thirty years has recognized that accurate diagnostic criteria allow for targeted interventions for those suffering from delirium. However, despite the advances made in understanding delirium, adverse outcomes persist.This article will first review how the evolution of diagnostic criteria has fostered improvements in the recognition of delirium and facilitated the development of therapeutic strategies. Second, we discuss how this foundation in approach to delirium has influenced outcomes and the evidence for causality. Finally, the candidate factors responsible for propagating adverse events are considered and future research direction outlined.

Sleep disturbance is a clinically significant problem in nearly one half of patients with dementia and is a predictor of cognitive and functional decline. There are multiple causes of sleep disturbance in dementia and all represent diagnostic and management challenges. Impaired circadian rhythm is a disorder characterized by an increase in daytime sleep with reduced night-time sleep, a reversal of the sleep/wake cycle. Such disrupted circadian rhythm may occur early in Alzheimer's disease, worsen over time, and is associated with behavioural disturbance, including aggression. In addition to the timing of sleep, the structure of sleep may deteriorate, giving rise to poor sleep quality.