What is the reason why I often dream of being chased by zombies and snakes at night?

Snakes are representative in some dream interpretation books. . . Being chased by zombies is because you watch too many TV novels. It's better to watch some funny or literary films or think about yourself before going to bed. Zombies have nothing to kill. . . Play the game of shooting zombies, and then, the dream becomes that you chase zombies. . .