This is a movie from the 70s or earlier (pre-1980). It is NOT “The Haunted”. A couple are in a house, there is a stain on the wall in their bedroom. They go to sleep, when they wake up the stain has grown bigger. This happens a few times, until they are engulfed by the growing stain. Or something like that.
Could be The Messenger (2007) https://www.youtube.com/watch?v=j8d6QLpy7_Y
Sorry, I missed where you wrote the year so I’m definitely off on this one 🙁