After a Kensho, which is kinda like a mini-satori I find my body chock full of very refined energy.
http://en.wikipedia.org/wiki/Kensho But I'd think that you would know that you had had the experience, maybe not in complete detail, but in essence. Sometimes you have spontaneous experiences. For instance a master might give you a koan and suddenly a lightbulb goes on over the monk's head and experiences enlightenment. But normally it is a memorable experience. You don't mention anything remarkable like shooting out of your body and expanding till you are the whole universe, or anything.
Spontaneous experiences are hard to reproduce at will. Meditation involves some work, but your accomplishments grow and can be reproduced at will --at least on a good day. If you think too much when you are meditating then you are either doing something wrong or you just haven't worked hard enough to learn how to clear your mind. As I've told people many times our egos, one part of our minds, wants to maintain control of our being. When we try to assert control using meditation the ego interferes. The Chinese call this phenomena 'monkey mind' because it causes our thoughts to scatter and to leap about like a monkey leaping from branch to branch. Through practice we can assert control over our ego. The ego isn't really our conscious mind or will, it just disguises itself as such. The ego is a good servant but a poor master, so we should try to transcend the ego. By doing so we can experience empty mind/ecstasy.