How old is he? Does he know how to get back down himself? Is he upset if you leave the room? What you pretty much end up doing is leaving the room. My dd plays in her crib for about 20 mins before falling asleep - standing, crawling, kicking, etc. If he gets upset when you leave the room you do a version of wi/wo (I believe in the pu/pd faqs) - you leave, he cries, you walk in, lay him down, coo sweet nothings, walk out, repeat until he stops crying.