Here's the trailer for Evil Dead. Don't watch if you plan on sleeping, regardless if whether you'll have the lights on or off. And in that spirit, I'm gonna post a scary trailer up through Halloween just to get everyone into a ghoulish spirit.
Again, this is a very mucho freaky trailer.
According this to this MTV article, this is worse than just any plain old rated-r movie. And a quick search shows that other sites agree that there is a lot of blood.