There's a chemical called cyclobenzaprine, prescribed as a (non-opiate) muscle relaxant called Flexeril, and THAT stuff will put you to sleep! It's odd because 50% of the time I try taking it in the day I just get really tired and go to sleep.... but the other 50% I get so "high" it's like being drunk without the blurred vision, slurring speach, or general "poisoned" feeling. I remember having it before philosophy class, because my back would lock up by the end of the prior class, and the whole time I sat there in total euphoria watching the walls move like waves