Bryan is just starting to learn to turn on his side as he falls asleep. The action is similar to that of a tortoise on its back, extending its neck backwards, desperately trying to flip itself over. Bryan would extend his neck backwards while stretching the legs and bending them slightly towards the back, causing his body to tilt over to one side or the other (lately it seems he prefers to the left side). Then he hugs his blanket as he suckles the pacifier to sleep (the only time of the day he will even take the pacifier nowadays).
Nobody taught him how to do any of that stuff. It’s amazing how brains just learns and improves upon itself so rapidly.