I can relate to you with this on a spiritual level, man. There have been numerous occasions in my life too where I can't sleep - mainly because just as I am trying to go to bed, my mind starts to race about all sorts of things like science-&-technology and philosophy stuff as well as things I want to build and create tommorow and the like - my mind practically never shuts off of its own and is always racing with thoughts, ideas and concepts that further stimulate my mind, so I have to take prescribed medicine to biochemically induce sleepiness so that I can actually go to sleep. I know how you feel, man.