Exhausted 2015 - as other TPers have suggested, would def recommend paracetomol (check with other meds & GP) to dispel aches and pains. We've tried all sorts over the years including a rainbow thing that projected on the ceiling for Mum. That was total pants because it couldn't even project onto the palm of my hand when it was 3" in front! However, a cheapo A**i lava, glitter lamp in soft orange/red has worked recently. I put it on to soothe MIL to help her get off to sleep (it's out of reach because the bottom gets a little hot); then I switch off, and put on again when she wakes up around 2-3 a.m.)
We've also tried classical music, new age music, whale sounds, sounds of the sea, played very softly and on repeat. Jazz or anything funky is a bad idea because it stimulates rather than soothes even if the person likes it. Music does seem to help a bit which is odd because MIL is as deaf as a doorpost. However, think Beethoven! I wonder if it's something to do with the vibrations.
MIL "vocalizes". For us, it's the sound of a reversing truck coupled with ululating at a decibels-worth, that would put a foghorn to shame. She doesn't appear to be distressed or in pain; or too hot or too cold. Or needing to go to the bathroom If anything, I would say it is more a call for attention. My Mum found comfort in a soft rabbit - MIL throws them out of her bed.
So try adding soft light and music into the mix. I'd suggest that the light is diffused and preferably playing across the wall or ceiling but out of eyesight, otherwise it might make matters worse. I'd avoid anything like backlit computers etc if playing music because that light's disruptive to sleep. MIL now has cot sides up so isn't at risk of tripping on wires or knocking over lamps.
Good luck. You might like to try the Ostrich Pillow to preserve your sanity.
Just sayin'.