DD1 has always been a night owl but increasingly can't sleep at night. She goes to bed around 7.30 with a good routine (bath, drink, teeth, story) and can read by herself until 8 or 8.15pm. However it's often 10pm before she's asleep. She potters around, sings, chats to teddies etc but just cannot sleep. She finds it difficult to get up in the morning (6.40am) and goes to school, followed most days by swimming. At the weekends she does gymnastics and we are often out walking, cycling, swimming etc so is tired. She's fine physically, normal in development terms and at the top end of her class. She's not worried about anything, except sometimes that she won't be able to sleep.
Should I just accept that I have a night owl or can anyone help?