I'm not sure where I stand on ghosts to be honest, I hope they're not real from an it would scare me shitless point of you, but there has been fairly solid evidence that may support the idea of the supernatural.
I don't however, believe in demons. I think things like cot deaths will eventually be explained by science, and to be honest evil things appearing in your head and so on to my mind at least is mental illness or an over active imagination, nothing more or less.
Oh and the disappearing socks in the washer happens to the best of us. A little green man is my friend and I's explanation:
zombie thread