We were doing quite well with bedtime, putting dd to bed v sleepy but not asleep so she could fall asleep herself in her cot. But now she's learnt to get from laying to sitting/standing if she's not ready she just gets up, even in her sleeping bag. And if I leave room she gets annoyed, flings herself around and bangs head. I'm now having to feed/cuddle her to sleep before putting her in cot. Help...