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ShiftShade™ is a simple, but effective, way to darken a room during daylight hours. It is useful for a variety of purposes, such as daytime sleepers (shift w ...
block sunlight  daytime sleep 
www.shiftshade.com - 2009-02-12
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Dedicated to promoting health and safety for shift workers and night shift work.
noight shift workers 
www.alertatwork.com - 2009-02-06
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