I wasn't sure if it you really wanted this question answered on a scientific level, but here's a paragraph about sleep deprivation.
Although many believe it to be true, and while animal studies suggest it is possible, it has never been proven that total sleep deprivation will eventually lead to death. There are no documented cases of a healthy human dying from total sleep deprivation. In carefully monitored experiments, several normal research subjects stayed awake for 10 days. While they all experienced cognitive deficits in memory, concentration, etc, none of them experienced serious medical, neurological, physiological or psychiatric problems.
I know this may sound corny, but have you tried self relaxation/meditation techniques? I don't know how the restless legs feel, but have you tried tiger balm on your legs(it is kinda like ben gay, but much better)? I wasn't sure if that would help, but hey, I'm trying. Sleepy time tea? I hope you get some sleep soon and 8 days off of opiates is something to be proud of.