Hate dreams!

I dunno why, for some reasons I always had bad dreams, and its really scary at times. Few days back, I was killed by a mutated dog with a scissor...Yesterday, me n my fren were chased by a crazy guy with knife...got lots more those kinda dreams..really dun understand why I have to dream this kinda stuff. Everytime I'll wake up in a shock, or wake up with sweat. Grr...so long never have a good dream already.