Abstract
Core temperature (tympanic and rectal temperatures) is lowered for several hours under diurnal bright light exposure and its evening fall is inhibited under evening bright light exposure. Melatonin may be involved in the behavior of these core temperatures. Diurnal bright light exposure for several hours may make dressing behavior and thermal sensibility in the evening cold slower and dull, compared with diurnal dim light exposure. On the contrary, evening bright light exposure for several hours may make the dressing behavior and thermal sensibility in the evening cold quicker and sharper, compared with evening dim light exposure. The underlying physiological mechanisms for these findings are that the thermoregulatory set-point would be reduced more markedly in the evening under the influence of higher elevation of melatonin under the diurnal bright light exposure, and its evening decline would be inhibited by suppression of the nocturnal rise of melatonin under evening bright light exposure.
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