Funny story, I was sent a free sample of a drug a online chemical supplier just started carrying. Included it in with a order of Bretazenil blotters I ordered. It is called pro- Diazepam.
The pro part just means it does not become Diazepam until your body converts it to diazepam through digestion. It would be illegal to sell Diazepam without a prescription but pro-Diazepam is just fine in Canada.
 Now I did  not know what this was, had never taken it before but from experience with other products if pro is in the prefix dose size should be a little more than the parent drug as some potency is lost in the conversion process to the parent drug.
Well I decided to try this as A sleep aid and just guest a amount to take. I was knocked out, and I mean out for over 12 hrs, the dogs could not even wake me, and I felt messed up for that day and part of the next, but man did I ever get good sleep, this was just what I should have have had when I had my tree felling accident. Anyway I went back to figure out why this hit me so hard and as best I can determine I took a order of magnitude more than I should have. Roughly greater than the equivalent of 90 ish mg of Diazepam in one shot. This is a drug I can highly recommend for pain relief, and sleeping aid, but only occasionally as from all I have read it can be highly addictive. So if you are in Canada this is a must have. I will put away 3 grams in my alternative medicine kit.