I would like DD (15 weeks) to start going to bed a bit earlier at nights. She is child number 3 and DP and I could do with a bit of quiet time before we retire. At the moment she goes down about 9pm and sleeps until 9am. Is it as simple as waking her earlier so she is ready for bed approx 12 hours later? We've tried putting her to bed around 8pm but she wakes after one sleep cycle and it is a real struggle to resettle her.