Sky’s brilliant hues may help bodies keep time

Our circadian clocks may keep time with the help of the sky’s brilliant colors. Nerve cells associated with internal clocks in mice appear to be more sensitive to changes in yellows and blues than to changes in the brightness of their environment, researchers report online April 17 in PLOS Biology.

Humans’ circadian clocks may work in a similar way. Manipulating the human clock with colored light could help shift workers and jet-setters keep better time with their bodies, the scientists suggest.