We give a lot of presentations where I work. I'm glad I've never seen anyone fall asleep...except for one client's pet dog that snores so loud and so much like a human being, my manager keeps looking around the room to spot who is sleeping...
Oh and the dog farts as well. Great for creating awkward moments - everyone else in the room moves on with their lives as you are still baffled as to what exactly is going on at this company.