I could see sleeping at my desk, but now for late night stuff, I would really prefer to work from home so I can sleep in my own bed. I dont see why you should have to sleep at your desk. The only reason really to be in the office is to interact with other people and unless everyone else is sleeping at their desks....
The cynic in me sees sleeping at you desk a purely showing of how far you are willing to go for no other reason.
Same with people who eat lunch, often with a work and knife, in their cubicles. It's not about saving a half hour. Maybe you can eat a sandwich and type at the same time. But really, are you saving that much time? And if you are not using your hands, can you not read your email while eating in the cafeteria?
I perceive things like that as work place theater.
