I also had problems sleeping and vivid dreams. I'm on day 24 of my first fast and it has been generally very positive. The headaches are gone. It's physically quite doable for me; the main difficulty has been the cravings. I successfully quit smoking and caffeine which I think has contributed alot to my feeling detoxed, but I still have continuous unhealthy food cravings and found that when I was sleeping poorly, or obsessing and worrying about things that I usually don't I remembered that the reason I didn't used to do that is that I would eat something. Taking away the comfort eating has really caused me to reacquaint myself with the worries that I submerged under the food for many years. I even think that as I loose weight and revisit the weight I was in the past that the worries that I was having at the time come back; but that's just me.