Asked by: the-virgin-and-virgil
Thanks for telling me about this- I had no idea! Here is the abstract for the article, it links to the Pubmed entry:
Physiological and behavioral rhythms are governed by an endogenous circadian clock. The response of the human circadian clock to extraocular light exposure was monitored by measurement of body temperature and melatonin concentrations throughout the circadian cycle before and after light pulses presented to the popliteal region (behind the knee). A systematic relation was found between the timing of the light pulse and the magnitude and direction of phase shifts, resulting in the generation of a phase response curve. These findings challenge the belief that mammals are incapable of extraretinal circadian phototransduction and have implications for the development of more effective treatments for sleep and circadian rhythm disorders.
I haven’t see any research related to your specific question, but circadian rhythms can be entrained by many different things such as stress to even the presence of dim light at night. In my opinion, this is one of the fields that is undergoing a massive boom- it seems like there is so much new information!