I originally published this on January 31, 2007 .
If you really read this blog “for the articles”, especially the chronobiology articles, you are aware that the light-dark cycle is the most powerful environmental cue entraining circadian clocks. But it is not the only one. Clocks can also be entrained by a host of other (“non-photic”) cues, e.g., scheduled meals, scheduled exercise, daily dose of melatonin, etc.
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