Moonstruck Primates: Owl Monkeys Need Moonlight as Much as a Biological Clock for Nocturnal Activity

A little bit of scientific evidence around the effect of moonlight on nocturnal activity (but only for Night Monkeys)

ScienceDaily (Sep. 11, 2010) — An international collaboration led by a University of Pennsylvania anthropologist has shown that environmental factors, like temperature and light, play as much of a role in the activity of traditionally nocturnal monkeys as the circadian rhythm that regulates periods of sleep and wakefulness.