DD did the same thing for us within the last few weeks. I think she had a growth spurt. She has her 2 bottom teeth, but nothing new is popping up.
DS has been sleeping 10-11.5 hrs/night for a couple months, but DD is always the challenging one! She was up at 1am last night, but for almost a week, she was sleeping 8-10hrs/night again.
We always have naps around 10am and 2pm (or 3-4 hours after waking up from 1st nap). Their naps can be 30min to 2.5 hrs long...We've always struggled with naps!!