Charly - Thanks for that. Lewis also sometimes lies on his playmat daydreaming on his tummy with his head to the side, so maybe he would just drift off like that if he was tired then. I usually put his sleeping bag on at 11pm when I dream feed him and he doesn't seem to turn as much then.
Funnilenough he can roll both ways,but only individually. He doesn't realise that if he rolls one way he can then roll back again! Bless them, this is a really cute age isn't it