My DS1 has just turned 13 months old and he is waking constantly at night. He has never been the best sleeper ie he doesn't sleep through the night but he doesn't usually wake this much. He goes to bed anywhere between 6.30pm and 8pm (depending on his day sleeps) and up until a week ago he wakes at about 4.30am for a drink then back to sleep. He had a cold a week ago and was waking constantly because he was coughing but the cough has gone and he is still waking up constantly. I have been heating his room now that its getting quite cold so I don't think its that. He is trying very hard to walk at the moment and I am transitioning him from formula to cows milk. I wouldn't have thought this could disrupt his sleep but maybe? Anyone else been though this?