Ay, hindi ko pa narinig yan sa aming grupo ng mums, pero parang something na dapat i-check with your pedia talaga para ma-rule out kung normal lang or something that needs attention. My cousin's baby naman had some jerky movements din while sleeping, at kinabahan siya kaya dinala agad sa doctor, at parang okay lang naman siya in the end, pero better safe than sorry talaga, lalo na kung baguhan ka pa lang with your baby's movements.