An abnormal fear of the natural satellite of the Earth: Selenophobia is often related to apprehensions about night or situations that might occur at a full moon.

The effects of the moon on human behavior, especially its influence on insanity, have been noted for centuries.

Although there is no scientific verification, professionals, such as nurses, police, and firemen and people who deal with large numbers of emergency situations, report an upsurge in activities and more extreme behaviors during a full moon than at other times.