Looking for a thriller/horror/war movie that (mostly) takes place in a room w/ table

I’m looking for a movie I saw a while ago and here is what I remember:

– The movie takes place in house/room with a table. The main character gets attacked by a man/creature (can’t remember what) and has to find a way to get through the day (this repeats every day).

– I always have Adrien Brody in mind but it’s not The Jacket, Wrecked, or Backtrack (but atmospheric-wise it’s in this category).

– SPOILER: In the end it turns out that the main character was heavily wounded in a war and just hallucinated everything.

Sorry, that’s all there is…thx!