Well, I think it's a great idea (I wouldn't take it), but I get the concept.
Encourage all the hotel guests to shut up, drink up, and go to bed.
It keeps them quiet if they are sleeping. It lowers the wear and tear of the room if they are laying catatonic in the bed and not touching things. lol
I think you just wrote their new advertising campaign to get a case of those in every hotel room in the world! Might be more cost effect for higher end rooms to just give them out for free ;instead of, a mint on your pillow.