Hi K.,
I love that book. I'm trying to remember what he says for this age. I believe that what you do is try to catch him before he gets too tired in the morning, no more than a couple of hours after he gets up for the day. Put him in his bed and leave him there for an hour, even if he cries. This is really difficult the first couple of days, and you have to distract yourself so you don't give in. There is another method, too, which involves going in to reassure him you're there, but not picking him up, but this I found even more difficult, and it took longer to get results. He may not sleep at all the first couple of times. If he doesn't, get him up and play, feed, whatever, and then put him down for a second nap earlier than you normally would. Same routine. Depending on whether or not he sleeps the second time, and how early in the day it is, you can do a third nap, or an early bedtime, like 5pm. But bedtime is bedtime, and you don't get him up til morning. This can be excruciating, especially the first night. I hesitate to pass on info. without you having the book in hand, because it sounds so cruel and cold-hearted, but the book explains it in sucha way that it makes sense and helps so much when you're wondering if you're doing the right thing. The premise is that sleep promotes sleep, thus the earlier bedtimes and not letting them get too tired before naptimes. I wish I could give you more specifics, but that's about the best I can do for now without getting the book and typing a whole chapter. Good luck.