You let him cry, wake everyone up and then you go on. Seriously, he is gonna cry - you have said that. So, it's a given. LET him cry it out and wake everyone for a few days. Just let them all lie and rest and allow him to scream if that is what he is CHOOSING to do. He WILL figure out that he is NOT getting up from nap and then he'll settle down. But you have to be consistent.