a good point by Dan. A customer service nightmare when you know that sleeping during the daylight hours is very common in vegas,

But then again, someone that was awakened at 12 noon with a DND sign on the door.....is good for casinos that

1- have the person say "now that I am up I might as well go downstairs and gamble

2- toss and turn not be able to get back to sleep and when the evening comes, he is overtired while gambling....add a couple fo drinks...and you have the perfect gambler from the casinos point of view