In "The Legend of Sleepy Hollow," why did Ichabod try to forget these stories when he walked through the forest at night?
Ichabod was a glutton for terror, as long as he was in the safety of some home or hearth, trading stories with the old Dutch wives. It was when he had to leave the safety that those stories would come rushing back to him and alone in the dark at the witching hour he was scared of the sound of his own footsteps "on the frosty crust beneath his feet". He would think of the stories they traded and then he would look at some shadowy shrub and think it a "spectre" or ghost. He was especially fearsome that he would turn around and find the "Galloping Hessian" riding up behind him in all his headless glory. I don't think he really could forget the stories, especially because he was alone at night.
Have you ever been scared? In The Legend of Sleepy Hollow, Ichabod Crane is terrified by the tales of the Headless Horseman, and a dark, scary forest is not the best place to be when one is scared. He probably imagined that every sound was the Headless Horseman coming to "get" him.