"Historically we only ever worked outdoors; two hundred years ago 75% of
the population worked outdoors now less than 10% of the population work
in natural outdoor light. Whilst this is fine in the Summer months when
there are longer daylight hours, in the Winter months, people tend to go
to work in the dark and go home in the dark and don’t get to enough
natural daylight.
This modern way of living has dramatically altered nature’s cues. A
modern day no longer starts at the break of dawn and ends at sunset.
Workdays are getting longer and many people face shift work schedules.
Additionally, the advent of electric lighting allows social gatherings
and personal activities to extend well into the night. These factors
have diminished the body’s natural ability to regulate the body clock
and this work/life change has resulted in a dramatic increase in light
deficiency symptoms."
Read More At: http://www.sad.org.uk/
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