Actually... there is some indication that social interaction to the point of mental exhaustion is helpful along with physical exhuastion.
The problem is that both tend to be good at INDUCING sleep, not MAINTAINING sleep.
I think that's why your Dr is giving you an XR hypnotic... to KEEP you asleep, but it doesn't sound as though either is working. If you'd like, I have a friend at Columbia med who's an endocrinologist (I may have mentioned elsewhere re: leg spasms... not sure), former paramedic, and now specializes in the medical end of sleep disorders. He may know of a compound or regimen which has shown some promise in cases such as yours.
Evo: I'd ask the same for you, but from what you'd said in the past it sounds like you're all over things already, and frankly... I'd be telling you what you already know. If I'm making a bad assumption there, let me know.
In the meantime, just in case this is more of a war than a battle, now while you're still in good shape, it might be good to find some kind of meditation (secular, religious, medical... whatever)... it can help pass time without consuming what you want to read, watch, type, etc.