Since we got back from our holiday last week my DD has seemed to be sleeping a lot more than before. She goes to bed between 8 and 8.30pm and doesn't get up til 9.30-10am, then by 1.30 she's ready for a nap and can sleep 2 hours or more. Just seems like a lot more than before when she was generally 8 til 8 and half an hour to 2 hours nap. Could it just be a growth spurt tiring her out or something? Or should I take her to the docs?