the way mountain mummy said to do it is the way the hospital taught me how to and when you wake up to turn over in the night (trust me you'll wake up feeling uncomfortable) just bring your arm up with them in it, put them on your tummy as you roll over and transfer them into the other arm - simple!

liberty has reflux and sometimes she will choke in her sleep and she will be silent but wriggling (she does this in the day too even when awake - her eyes bulge, scary stuff) so with co-sleeping i wake up to her wriggling and get her up to prevent her choking. i do have a monitor in her cot though for day sleeps.