Baby is 9months old has always been great at self settling at bedtime would chat to herself for a few mins then fall asleep. Now that she can crawl an climb thats it - no matter how tired at bedtime gets in the cot and climbs round at first very happy then repeatedly bangs her head against the cot. After about two hours of putting her back on her back we keep giving up and rocking her to sleep 🙈 what am i doing wrong? Any tips?