Availability of artificial light and light-emitting devices have altered human temporal life,
allowing 24-hour healthcare, commerce and production, and expanding social life around …

Light is an essential part of many life forms. The natural light–dark cycle has been the
dominant stimulus for circadian rhythms throughout human evolution. Artificial light has …

Seasonal changes in day length (photoperiod) affect numerous physiological functions. The
suprachiasmatic nucleus (SCN)–paraventricular nucleus (PVN) axis plays a key role in …

A variety of organisms including mammals have evolved a 24h, self-sustained timekeeping
machinery known as the circadian clock (biological clock), which enables to anticipate …

Background The majority of people with dementia have behavioral and psychological
symptoms of dementia (BPSD), including depression, anxiety and agitation. These may be …

Seasonal affective disorder is a mood disorder that is a subtype or qualifier of major
depressive disorder or bipolar disorder in the Diagnostic and Statistical Manual of Mental …

Introduction Despite the growing number of different therapeutic options, treatment of
depression is still a challenge. A broader perspective reveals the benefits of bright light …

Circadian medicine, the study of the effects of time on health and disease has seen an
uprising in recent years as a means to enhance health and performance, and optimize …

In relation to human health and functioning, light, or more specifically optical radiation, plays
many roles, beyond allowing vision. These may be summarized as: regulation of circadian …

Light exposure and mealtime act as cues to the human circadian rhythm, which
subsequently regulates various physiological functions in the body. However, modernization …