Crap...stupid phone!
As I was saying, fitful is an understatement.
He thrashes, groans, squeaks, strains, barks, makes weird goaty bleating sounds...lifts his legs and thumps them down again. We have a snuzpod attached to our bed and he's so strong for a small baby that the crib bangs loudly against our bed! He appears to be asleep (or at least has his eyes closed) throughout this and it tends to come in waves. The deeper asleep he is, the more rested, but he seems to really struggle to settle into deep sleep.
We've tried; raising the head of the crib, raising his legs with a towel, a crib wedge, white noise, Comfort formula, swaddling, grobags, infacol, dentinox, gripe water...we think it may be wind (he is excessively farty 
) but he always brings up wind well and has no problems feeding/pooing.
He is a joy during the day, on the whole a happy, smiley baby. He doesn't sleep much in the day (maybe 4-5 hours) but when he does it's either in his car seat/pram when we're out and about, or flat on his back on the sofa- no grunting/groaning/thrashing then which has made me discount things like reflux because surely that'd cause discomfort any time? He's currently dozing flat on his back on our bed (fished him out of the Snuzpod) as tranquil as anything.
I suppose I really want to know if this noisy sleeping is a phase. Will he grow out of it, or am I going to have to consider moving him to his own room before we'd planned, just so I can get some kip? I've tried earplugs, he's that loud I can still hear him! It's frustrating as I'm often sandwiched betwixt thrashing, grunty baby and snoring husband, and it feels like every other bastard is getting a bit of shut-eye apart from me!