Hm, those Japanese horror films where scary (Grudge 1 & 2); but while people say they couldn't sleep for three days after watching that, I got over it in a day.
I did watch a Malay film called Pontianak Haram Sundal Malam (literally Vampire Lady, it tells the story of a female vampire who is seeking revenged on those who killed her). I couldn't get over that Lady's face in two days!
I was told "The Exorcist" was a scary film....... and my mother particularly said the head-spinning part was most scary, but I laughed out during that part of the movie.
And so was Evil Dead. My father said it was his scary movie, so I watched. But it wasn't so scary (I guess the effects made it laughable) but granted, it was very suspenseful!
I have watched all Friday the 13th and Nightmare on Elm Street.... they're just a overdose of highly grossly creative imagination... Yet, no I won't curl up under my blanket. If anything horror films are suspense. They don't make me want to switch on the lights the whole night away.....