I used to dream of things that came true later on. I dreamt of 9/11 two months before it happened and the dream was very vivid and specific. I haven't had dreams like that for several years now. I actually believe that part of it has to do with your physical fitness level. When I was having those dreams I was very physically fit. Sleeping came very easily also. I haven't been fit for several years now and I have some problems staying asleep.