I know babies are supposed to make noises when they sleep, but in the last couple of nights, around 3-4am, DS (6 weeks) has been kicking off big style, with flailing arms, kicking legs and lots of cries and grunts, for up to half an hour - but he's fast asleep and resists waking up. This obviously keeps DH and I awake as he's making a huge racket, and we're worried that he's in distress or having nightmares (if newborns can have nightmares?).
So what should we do if/when this happens again? Wake him up and resettle him? (He normally settles fine after a feed though it can take a while.) Or invest in some earplugs and let him get on with it, on the grounds that as long as he's asleep and not actually crying for us, he's OK? Any thoughts welcome...