A man is trying to get to sleep in an hotel bedroom...he's tossing and turning, but no matter how much he tries, he still can't fall asleep. Finally, he picks up the telephone, dials a number, replaces the receiver without saying a word, gets back into bed and falls asleep without any problem. How?
For those who already know this (jarremachine!), let others who don't know have a chance to figure it out. You can ask questions that require a 'yes' or 'no' answer, but nothing else.