Probably already been brought up here, but "HUSH" on Netflix.
Take Misery, Green Room, Wait Until Dark, and Halloween. Put them in a blender and have the results exceed all expectations and you'll get this flick.
You don't need CGI, jump scares, excessive gore, or ridiculous premises to create absolute suspense/horror/terror. This flick proves it.
Note: About 90% of the movie happens at night with lots of darkness so don't watch it unless you are in a dark room.
5 stars all the way baby!