The human body clock regulates not only daily rhythms such as sleeping and waking, but also
seasonal changes in physiology. Humans that live in temperate zones where the climate changes with the seasons
exhibit seasonal changes in behavior and activity just as other mammals do. The normal response of mammals to
the changing seasons is to alter their activities and behaviors with respect to eating, sleeping, socialization,
and sexual activity.
It is the changing day length that signals the changes of the seasons to the internal body clock.
In all mammals, including humans, information regarding the day length reaches the brain by way of a neural pathway
from the eye to the biological clock in the brain.
When seasonal changes of mood prevent normal functioning, this becomses a problem for many people. For those where this problem becomes severe it is termed Seasonal Affective Disorder, also known by its acronym SAD. Sad is defined as a major depression with a seasonal pattern, or seasonal depression. Light therapy in winter can be used to make the days appear longer. This restores the summer pattern of sleep and metabolic activity, and restores the mood to a summer level.
One function of the body clock is to regulate the production of the hormone melatonin in the
pineal gland. Melatonin has widespread influence on brain activity and influences serotonergic neural pathways,
including those which affect mood. Studies suggest that light therapy can be used to alter the activity of these
serotonergic pathways, and light therapy has accordingly been proposed, and used, as an alternative to treatment
ith drugs for many forms of depression.
Read more on studies with light therapy for major depression and bipolar depression
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The Sunnex Biotechnologies Lo-LIGHT phototherapy lamp comes with a five year warranty. Details