If you think about it, if you are feeling ill, the last thing you want is hordes of other 'people' thronging around and making a racket. I think they just feel off colour, take themselves off to somewhere nice and quiet to have a bit of a peaceful rest and then nature takes over. A nice way to go in my opinion - my poor dad dropped down in the middle of a busy shopping centre and was surrounded by dozens of peeking busybodies. Much rather go quietly and alone than in those circumstances.