Identification of brown butterfly with orange/black/white spots
I think this is the "Dark Evening Brown" or Melanitis phedima possibly Melanitis phedima bela:





Some further information can be found here (image 1) and here (image 2). If you look close at the second image, you can see the spot on the wing.

Why they are coming into the houses is something I can only speculate about, but probably they are either attracted by light or by warmth.