Hi, my 4mo ds has started, in the past couple of weeks, thrashing his head from side to side in the night. He has a feed at 11.30 and settles v quickly to sleep in his crib next to our bed, and then tends to semi-wake about 2.30. It's a very odd movement - he turns his head a little to the left and then whips it right round to the right, quite forcefully, almost banging it into the mattress. He doesn't always wake up when doing it, but it's very noisy and can go on for a good while, and he doesn't look happy IYSWIM. If it does wake him up, he's often upset and needs feeding (he is bf and generally needs a feed in the night anyway, so that's OK). Just wondered if anyone else has experienced this and what on earth might be causing it. He hadn't really lost any hair up to this point, but now his sheet is covered in it in the mornings!
TIA