Why nightmares might actually be a good thing

As if the real world weren't scary enough, we celebrate our fears every October. On Halloween the creepy costumes come out, and every year it seems Hollywood trots out a new movie with a familiar plot line.

"Halloween Kills" is the 12th (yes, 12th) installment in the series since 1978.

You probably remember your first Halloween movie, but did it give you bad dreams, or a nightmare?