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An overview of circadian rhythms and related topics of chronobiology, common sleep disorders, human reliability, actigraphy, and circadian rhythm sleep disorders.
http://www.circadiansleep.com/
Publishes papers on all aspects of circadian and nycthemeral (daily) rhythms in living organisms, including processes associated with photoperiodism and daily torpor.
http://www.jcircadianrhythms.com/