Thanks for the replies. It's nice to know my little guy isn't the only one! Celesyee - yup, "Daniel" does that too! He can stay up all day without a single nap happily playing. I think he just doesn't want to miss anything. I do
try to keep him on a schedule. I try putting him down at roughly the same times every day. I'm just not getting a lot of buy in.

Onthejourney - I like your suggestions. It's a great point. We have a definite routine for bedtime. We do at naptime, too - but once we get in a habit and he starts to recognize certain cues that indicate it's naptime, he starts to fight like mad. Maybe we just haven't found the right routine.
My concern with letting him cry it out at this point is that he came to us at 3 months and I worry that it will affect his ability to attach securely. Right now, I wear him around a lot, and I repond to his cries quickly. But I think that may be what we'll have to do eventually. At what age did you start that with your son, fisbaby? And how long does he cry before he finally falls asleep?