My 5.5 month-old LO was notorious for the 30 minute nap. After 2 months of PU'PD and pat/sh, she has finally been taking 1 1/2 hour naps for the past month. Now, today, both of her naps have been weird, like 38 min & 42 min. and then she fusses for 15-20 min. before going back to sleep, where she HAD been going for an hour and a half straight. The only thing different in her routine the last few days has been that she has fewer night wakings. Shouldn't that be HELPING?! And - she doesn't just wake up & fuss after these brief naps.... she is ANGRY! Why, after almost a month of finally having good naps, would she just.... stop? And they are ridiculously random lengths, and so I don't understand what it could be! HELP!