Odd meditation experience.

Well, a long day prevented me from posting this before now.

I had an odd experience last night, while meditating after taking some Nyqil.  Probably not the smartest thing to attempt, since any results would be suspect, but I wouldn't be the first person to use a substance and then attempt something metaphysical related.

I was meditating, and I had an odd sensation.  Instead of the usual 'I can feel energy' sensation it was more like a rhythmic pounding.  Not that many people would understand the sound I'm talking about.  Its was something akin to something bouncing off of a rotating blade at a high rate of speed, a rhythmic pounding.

I was lying back feeling the energy. But instead of being smooth, it felt like that.  It also felt like my arms and legs were getting pulled away from my core.  Down, and away, and then after being stretched, away  to my left. All the while, the rhythmic pounding.  It was just an odd experience. I fell asleep a short while afterwards.