Here are some lists of super scary books that might be better off read during the light of day. Or, since it's Halloween, you can sit in a dark room with friends and read out loud to get your spook on. ...Your choice.
LIST 25's 25 Scary Books That Will Keep You Up at Night
Amazon UK's Horror Books That Will Keep You Awake All Night
Mandatory's 20 Terrifying Two-Sentence Horror Stories
Thought Catalog's 13 Short, Creepy Stories That Will Scare the Crap Out of You