To sleep perchance to dream

Getting a wee bit tired now. On the whole Rufus is pretty good - he has his days - like yesterday when we miss the window for a nap and he gets very overtired and then won't settle despite all our efforts - but that's our fault and we have to pay the price.

But we are a bit perplexed by his nighttime shenanigans. He wakes up every two-three hours (depending on the day or night should I say) to feed - nothing too unusual there given his age. However after the 1.30/2am feed he settles back to sleep fine and then all of a sudden it starts. He roars and grunts and groans and chunters so I end up getting in and out of bed to check him. The thing is he seems to be asleep. He won't have his dummy and if I get him up to feed him he'll take a few minutes and then drop off again. It's very odd - and not at all conducive to sleep.

I resorted to bringing him into bed with me - something I really didn't want to do - but it seems to work. Snuggled up next to me he doesn't seem to feel the need to grunt. The thing is that I find it hard to sleep because I'm worried about squashing him or waking him up if I move too much.

I have googled in vain - nothing official seems to explain it. There are lots of mums on chat rooms complaining that their baby is rather adept at pig impressions too - but no one seems to have an answer for it. Maybe he'll grow out of it, maybe it's because he's a bit chilly in his own bed (he's in a grobag and a sleep suit as per the instructions - but maybe he's a baby that need to be warmer?), maybe I'll learn to sleep through it (I doubt it - it's REALLT loud). SO does anyone have any advice - any tricks to make him sleep peacefully - as he does during the day when he doesn't make a sound, or any suggestions for helping me sleep through it? Help!