I could never bring myself to do it, I always just felt stupid and uncomfortable wearing sunglasses inside.
And what others have pointed out is correct, the eyes aren't the only things that give off tells - there are a heap of other visual cues you can take.
Having said all that though, I think wearing sunglasses is probably +EV. There's really no downside to you as a player if you wear them, and if they block even a few small tells then that's a net positive for you.