Dreaming and learning may be part of the same process, a new study from the Harvard Medical School suggests. In the study, volunteers played the rightly hallowed FPS, DOOM, and then answered questions about their dreams. Often, elements from DOOM would turn up in their dreams, like shotguns, blood, and demons.

“It really looks like if you’re not dreaming about it, you’re not getting better,” says Robert Stickgold, one of the researchers in the study.

Read more at ABC News.