T.H.
I'm in the same boat here, daughter will be 4 in Sept. too. I think it just means they're growing out of naps:( For the last year my daughter has had a very on and off schedule with naps. Right now, we're off, and it just feels like this is it! I'm so bummed! I think just keep having him play by himself for a while and don't worry about the bathroom stuff, he'll get bored of that if you don't make a big deal about it. As far as being cranky, well I think once he gets more used to this schedule then he'll be less cranky. I have put my daughter to bed at 7:15 or 7:30 on no nap days b/c she really needs it (her usual bedtime is between 7:30-8) and she has slept just fine and wakes up at the same time, not earlier. Until then just use consistent discipline in those cranky times and hang in there!