My boy loves to 側睡 very much started a month ago. And his neck is bending backward. The posture is just like the half-way of turning over and stopped right there and then go to sleep.
Actually, I'm pretty worried about this sleeping posture since I think that it's quite tired sleeping like this. And I'm afriad that this could cause adverse development of his internal organs. However, if we force him to sleep in normal position, he doesn't like it and couldn't sleep.
Exactly the same posture as my boy! He likes to sleep that way, I tried to slowly move him after he was in deep sleep, sometimes it is ok, but sometimes he would be awake and start to cry... But I found that now, after a few weeks, he starts to sleep in this posture, but he will move back to a normal posture after about 1 or 2 hours.