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Sundowning: severe dementia and bringing on the night

Wayne Alan Simon ariess at bellsouth.net
Sat Mar 29 02:33:53 EST 2003

Many biological systems are effected by daylight or lack thereof.  Some are
turned on and off via the light. Some are increased or decreased from light
( various sources and wavelengths).  Evolving on a planet that for the most
part has day and night cycles, has also allowed for various adaptations or
maladaptions based on the planets light darkness cycle. Of course if you
live in an area that is light half the year and dark half the year, you may
find your biological systems adapted quite differently.  Diurnal variations
in most neurohormonal and endocrine systems is the rule and not the
exception.  Vitamin D, as mentioned many times is just one factor of many.
The situation is complex, and to shed a little "light" on the subject is
always enlightening!

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