my 6 wo ds seems to have lost the ability to sleep! He'll fall asleep ok at the breast, in the pram or being rocked, but wakes almost immediately crying because he is so tired. it's exhausting - at night one of us is having to hold him in our arms for anyone to get any sleep, and in the day I'm wearing him in a sling almost constantly although worryingly even that doesn't seem to be working any more. Any ideas how we can make sure he stays asleep after dropping off - we're exhausted and I'm not sure how much more I can take