For the past week or so, DD seems *slightly* tired at bedtime (some eye rubbing, crankiness, etc.) but the second we put her in the crib she is WIRED, after months of pretty reliably snuggling down with her blanket and drifting off within 15 minutes or so. She doesn't really fuss, except a little if we leave the room, but I've been leaving her because my presence just seems to wire her--I try to put her down or rock her and sing to her like usual, and she starts jumping, giggling, asking me to tickle her feet...then when I leave the room, she is talking/yelling on and off for a good 45 minutes. Last night she hung out in her crib awake for almost two hours--not fussing, but goofing around alternating with lying quietly with her eyes open. Around 9:20 she started yelling "I all done with my nap!"
She's been taking pretty solid naps--around 2 or 2.5 hours. So I guess I wonder if she's getting so much day sleep that she's ready for a later bedtime, since she gets goofy, not fussy? (In the past she has always fussed a lot when she was truly tired.) Bedtime has been 7:30-8, but lately she's been falling asleep closer to 9 (and last night, 10). She wakes up for the day between 7 and 8.
Or, because this is such a sudden change, might it be just a phase?