At a certain point, people become very bold when it comes to sleeping on the bus or train. After awhile, you get comfortable and no longer care what people think. Think about it. If you've been writing one particular bus for thirty years, are you going to let some punk tell you that you can't lay down across four seats? Hell no you aren't. By that time you've learned to become people's problem instead of letting them become yours.
Sometimes this is totally cool behavior though. If it's midnight on the last train and the bus isn't near full, then you might as well lay down. There is nothing wrong with that. If this was at 7am I might have some qualms with it though. I'd just end up laying on her stomach. Or, at least I think it's a her.