You, my friend, just experienced an endorphin high. I used to get them about every ride when I really pushed myself and always as a licensed racer. You are right, you kind of leave your bicycle and almost as if you are just flying along watching yourself ride. Absolutely the best feeling you can have. I have had had 3 near death experiences and they pretty similar to each other less the glowing soft lights. Now that I'm in my 60's it's hard to get the endorphins to kick in darn it!