Here is the Science News article on how amber is the color light that has the least negative effect on the body's own melatonin production: http://www.sciencenews.org/articles/20060527/bob9.asp Week of May 27, 2006; Vol. 169, No. 21 , p. 330 Light Impacts Hue and timing determine whether rays are beneficial or detrimental by Janet Raloff I know I had a post here when the article came out, the same as I did for related articles so details and further links can be found in those in the FML Archives. Previous studies show that the worst color light for disrupting the body's own melatonin production is blue, followed closely by green. (So, think blue to wake up and amber to get drowsy.) Sukie (not a vet) Current FHL address: http://groups.yahoo.com/group/ferrethealth Recommended ferret health links: http://pets.groups.yahoo.com/group/ferrethealth/ http://ferrethealth.org/archive/ http://www.afip.org/ferrets/index.html http://www.miamiferret.org/fhc/ http://www.ferretcongress.org/ http://www.trifl.org/index.shtml http://homepage.mac.com/sukie/sukiesferretlinks.html [Posted in FML 5554]