I know this isn't an Anime. But it's a manga called Rabbit Doubt. It has 3 different series. Doubt,Judgment, Secret. This is really scary. I first found out about Rabbit Doubt when The anime Man Joey showed it in his parte superior, arriba 10 manga that should be an anime Video. And it kept me up scares of the dark for a few months. But now I'm getting over it. tu should give Rabbit Doubt a try. There are scary Anime. But some Horror anime hasn't scared me yet. I seen Another and Corps Party. Didn't scare. Just way to bloody and gross. Lolz. Also DangonRonpa the animación is a great Horror Anime. So is Tokyo Ghoul.