Yeah, this usually happens to me. It's weird, after I go to sleep, I wake up the next day and feel it a little, but it usually really seems to kick back in about 1-2 hours after I wake up, and I start getting this weird body high. I smoked the night before my Spanish exam the other day, figuring I'd be fine, and then throughout the whole exam I had this nice body high, but it made it really hard to focus, aha. Probably not a great idea, but it's done with now, and it made the exam more interesting.