I'm with the murdering & dumping.
I doubt this'll help but... mine gruffles a bit at night, if she's on her back. At first, I tried politely to wake her. No dice. I would then become annoyed that she would not awake, so I angrily awoke her, which of course, precipitated a late night row, coz I was by then very irritated. I have now learned to pretend to be angry, because no amount of polite cajoling will awake her & produce any results. I shout angrily at her to turn over, she responds immediately, in her sleep, with no need for late night rows :D
... which is good because the murdering & dumping was next on my "to try" list.
edit : Try to get some dose during the day while the missus is awake anyway Stone, have a nap in the afternoon if possible, or sleep in once the missus is up. As well as that, have an early night, let the missus read a book or listen to HER headphones. Getting a couple extra hours twice a day will improve your outlook loads. You guys have seperate rooms in the UK, or something?