Was listening to this song earlier and had a thought.

Do they mean that sunlight always shines through the window onto the TV? Or do they mean when watching a film or programme on TV, the sun is always shining in them?

Always felt it was the former?

It`s the latter.

haha they can't see the tv because it's too sunny, inspired writing

I always felt the song was about how life was better in TV shows/films than in real life.