Fighting sleep

My LO has been fighting naps and nighttime sleep like crazy! The last few days it's taken almost two hours to get her down for a nap, one of the days she skipped it completely. Her naps have be closer to an hour than the two hours they normally are.

We start bedtime at 8 and normally she's asleep by 9. Lately it's been like 10 or 1030. She just stands in her crib with her head on the rail. Sometimes she'll cry but sometimes she just stands there resting her head.

Anyone else going through a sleep thing right now?