To dream of a maniac suggests a situation in your waking life may be pushing you over the edge.
To dream of yourself as a maniac indicates that it may be time to hand over control and take a break from a current work project.
To dream of yourself or another person suddenly becoming maniacal implies that you have resentment and you may need to examine stress levels in your waking life.
[1]See “crazy”
[2]See Also: Insanity.
[3]