I think green tea may be able to stimulate your ability to have a lucid dream. I drank nothing but green tea for about 4 days and I was able to remember while I was sleeping that I was dreaming. I recognized the fact that I was dreaming and ended up being able to manipulate the situation and people, it only lasted littel bit and the whole dream would just fade away then it came back to me when I would fall asleep agian.

Think the green tea had to do with anything? Maybe it stimulates your memory thus stimulating your ability to have a lucid dream. (the night of that dream I had about 4 bottles/cans of the stuff 2 Lipton green tea's 1 Arizona green tea and one turners green tea on the other 4 of the days I only drank 1 or 2 of them)

Just a thought.