Some of the most interesting experiences I have had as a single mother was watching horror/thriller movies at night by myself. You would think I would have learnt my lesson after the first time of being so scared I actually packed the kids up and went to my dad's place for the night! But no, I kept watching them (especially the ones with eye candy in them)!
I don't tend to scare easily when it comes to horror films. Suspense horror films can make me jump, but they don't give me nightmares. I can easily watch them alone at night, but it isn't particularly a genre I go for.
I don't really watch a lot of horror movies. I prefer thrillers, which aren't as scary. I did watch a lot of Stephen King movies as a young teen and enjoyed them. It wouldn't bother me if I was alone or not.
I watched both the Amityville Horror and The Exorcist on my own (years ago). They were the only two I watched on my own, ever. And, it cured my lust for doing that sort of thing ever again. The Amityville Horror was dreadful, because if you saw that movie and remember, that you don't actually SEE anything at all.