Hmm, that's really interesting. I was wondering whether it was because DS sleeps further away from me, but, nicky, it sounds as if some babies do just cry a bit. Between cycles of his long lunchtime nap he cries differently (or just wakes and shuffles around). 
Last night I cuddled him all night (he was unsettled in the late evening) and although he started to cry a couple of times, it only lasted about 1 second before a cuddle settled him. He was lying on his back/side, though. Normally he lies on his stomach, so I normally have to roll him over before feeding him.
I think the cry is a 'I want to get back to sleep but I need some help, please' - he does it usually around 5 times between going to bed and waking for the day. If it's before I've gone to bed and it takes me a minute or two to get to him, it does escalate. It's not just about wanting bf, as he'll often be happily rocked back to sleep instead. It does sound like a windy grizzle, Ennis, but I don't think that's the problem.
Sometimes when he wakes and grizzles, I'll feed him and he'll eventually come off and start grizzling again.
If I pick him up and rock him then he'll go back off - unless he doesn't want to be put back down, when he starts again as soon as he touches the bed.
I might try more nights of sleeping holding him to see if it reduces the crying. It'd be nice for DH to be able to join us, but he'd be too disturbed by DS as he is now (DH suffers from insomnia).
Bertie, IIRC, Deborah Jackson agreed - I think she said that for less than 15 seconds awake you don't remember.
Ennis, wow, that's amazing about your DS not crying.
DS cried LOTS in the first 4 months, but he was colicky and overtired for most of that time.
nicky, love the name! They all have their quirks, don't they - DS is better in the second half of the night and usually goes through one cycle change without waking then.