DS has always been rubbish at sleeping. About 18 months ago we started co-sleeping as we were at the end of ourselves and just needed to sleep. He goes to bed in his room but comes into ours late ev sigh when he wakes up. But now he's 3.5 and taking up a lot of space in bed, I'm 8 weeks pregnant and want to try and get him back to sleeping in his own bed so we get better sleep and we have more space before I get a big bump... anyone successfully done this at this age, what worked?!