Older adults do not sleep as well as younger adults. Why? What alterations in sleep quantity
and quality occur as we age, and are there functional consequences? What are the …

Sleep is important for optimal cognitive functioning across the lifespan. Among older adults
(≥ 55 years), self-reported short and long sleep durations have been repeatedly, albeit …

A common feature of aging is the advance of the timing of sleep to earlier hours, 1–7 often
earlier than desired. 8–10 The sleep of older people is also characterized by an increased …

Objective: Previous cross‐sectional studies have observed alterations in activity rhythms in
dementia patients but the direction of causation is unclear. We determined whether …

Although peaks and troughs in cognitive performance characterize our daily functioning,
time-of-day fluctuations remain marginally considered in the domain of cognitive psychology …

Melatonin is a molecule present in a multitude of taxa and may be ubiquitous in organisms. It
has been found in bacteria, unicellular eukaryotes, macroalgae, fungi, plants and animals. A …

Circadian clocks drive cyclic variations in many aspects of physiology, but some daily
variations are evoked by periodic changes in the environment or sleep–wake state and …

The investigation of time-of-day effects on cognitive performance began in the early days of
psychophysiological performance assessments. Since then, standardised, highly controlled …

It is well known that seizures of some types of epilepsy tend to occur in patterns. The
circadian rhythm may play a significant role in this phenomenon. In animal studies it has …

Objective: To investigate whether age-related and experimental reductions in SWS and
sleep continuity are associated with increased daytime sleep propensity. Methods …