I woke up in the middle of the night feeling high as hell, but I didn't smoke or do any drugs?

I have had that happen - wake up from a dream where you are smoking, and you are flying for a few minutes - or another thing that happens to me, is if the weather is just right, and certain songs are on the radio, I'll have a creeper hit me for few minutes. Neurologically speaking those things are called "state dependent memory" - most people are more familiar with it in another (much milder) form: say how a waft of a scent can take you to another place and time.