T. Morita et al., INHIBITORY EFFECT OF LIGHT OF DIFFERENT WAVELENGTHS ON THE FALL OF CORE TEMPERATURE DURING THE NIGHTTIME, Japanese Journal of Physiology, 45(4), 1995, pp. 667-671
Nocturnal core temperature fall was significantly inhibited by green,
blue, and red light exposure with 1,0001x from 21:00 h to 02:00 h. The
core temperature in red became identical from that in control during
the following sleep period, but not in green and blue. These findings
are discussed in terms of urinary melatonin behavior.