I'm in sorta the same boat...30 min naps (or so) and wakes up happy, goes down easily, but on a 3 hour EASY because of it. My son is also 5 months old (will be 6 months this week).
I'd love to hear what others think it could be, too.
My gut says the EASY is off...but if we're in a constant state of UT or OT then how can I ever get the EASY correct?
Also, if they wake happy, then do we even try to extend the nap? It seems like if he wakes happy I can't extend it. And if I let him lay until he is unhappy and THEN try to do it I have a very low rate of success extending the nap, too.
I thought waking happy was UT but if his naps are so short, then do I shorten the A time due to the short nap or lengthen it because he's UT and waking calm and happy? :/
Are your experiences the same?