Light Suppresses Melatonin Secretion in Humans. A.J. Lewy, T.A. Wehr, F.K. Goodwin, D.A. Newsome, and S.P. Markey. Science 1980; 210:1267-1269
"Bright artificial light suppressed nocturnal secretion of melatonin in six
normal human subjects. Room light of less intensity, which is sufficient to
suppress melatonin secretion in other mammals, failed to do so in
humans. In contrast to the results of previous experiments in which
ordinary room light was used, these findings establish that the human
response to light is qualitatively similar to that of other mammals."