knock
Bluelighter
Doesn't help sleep at all for me at least, small doses with beer might do, but dissociative doses definately don't
I find small (in truth, any size) doses of MXE or Ket are stimulating and keep me awake. I've had the occasional fat line of K "to knock me out" but it's just an excuse for another mind-spin while I lie in bed.
Only drugs that make me actually sleep are benzos. I have fallen in love with O-desmethyltramadol, a µ-opioid agonist, but even that doesn't deliver proper deep sleep, just a few hours of a dream/wake/dream/wake cycle (a very nice thing actually).