Yeah, Deus strikes me as the kind of guy who has his bodyguard follow him into the bathroom because he expects his many enemies will assume he doesn't and try to ambush him there. The only reason a bodyguard would ever not be at Deus' side is if the bodyguard needs to sleep, and then there'd be another bodyguard of similar capability taking the shift. Deus sleeping is another obvious ambush point, so of course he has a bodyguard watch him sleep too.