Moscow At Night, Russia

The belief in magic often includes the idea that magic and magicians are more powerful at night. Seances of spiritualism are usually conducted closer to midnight. Similarly, mythical and folkloric creatures as vampires, and werewolves are described as being more active at night. Ghosts are believed to wander around almost exclusively during night-time. In almost all cultures, there exist stories and legends warning of the dangers of night-time. In fact, the Saxons called the darkness of night the 'death mist'.
In literature, night and the lack of light are often color-associated with blackness which is historically symbolic in many cultures for villainy, non-existence, or a lack of knowledge (with the knowledge usually symbolized by light or illumination).