Is this a universal problem with all N doms?? My mind never shuts up, and funny enough, I too have found that writing things down, especially around bed time, when I most need my mind to shut up, helps a great deal. Walking around, doing anything really, I am constantly thinking of things such as what this reminds me of, what that reminds me of, what if I did this with that, etc. The list goes on and on. I can't stay in any art museum longer than a few hours only because of how much mental stimulation I get from it, it's a rush of thoughts.