![](https://i.kinja-img.com/gawker-media/image/upload/c_fit,fl_progressive,q_80,w_636/78825f2b62b7d102d42d4131ccdfdbbd.png)
Nightmare has an unfortunately generic title, but it’s the word in its most literal usage, referring to the “Mare”—a creature from folklore thought to torment sleepers. In Norwegian writer-director Kjersti Helen Raasmussen’s new film, coming to Shudder this week, it takes the form of a particularly nasty dream demon.