For thousands of years, doctors and mental health professionals believed in a strong connection between mania and the moon. Hippocrates, considered the father of modern medicine, wrote in the 5th century B.C. that “one who is seized with terror, fright and madness during the night is being visited by the goddess of the moon.” In 18th-century England, people on trial for murder could campaign for a lighter sentence on grounds of lunacy if the crime occurred under a full moon.