Our 10 month old son has suddenly become a bad sleeper. He has been in routine from early days and he has thrived with it. From 7 months he started sleeping through the night and he learnt to self sooth and fall asleep on his own after evening routine. Until now he has also had two long sleeps during the day. Suddenly, a week ago he has become a nightmare to put to sleep. Despite our evening routine which involves bath, calming down time, books and song he seems to excited to fall asleep standing in his cot and screaming his head off if we leave him on his own. If we stay to pat him he still doesn't sleep and can start playing. It has taken us the whole evening to get him to sleep. He is tired but is clearly fighting sleep. The same applies to daytime sleep. He used to love his sleep and regularly slept 2h in the morning and the same in the afternoon. Does anyone have any advice what we could do?