Talk:"Can't Wait Till Christmas!"/@comment-25556314-20141119032831/@comment-24112118-20141119033654

"Zombie Mode = When players are doing all they can to stay on the game to climb towers, they save health and time simply by playing during the middle of the night and keeping themselves awake."

Basically, it is to stay awake or sleep as little as possible so you are not waste your spirit by letting it overflow.