for the last few weeks i've noticed i have been sleeping less and less... first just taking an hour to get to sleep. now it takes up to 4 hours and sometimes im not even sleeping at all- i have a feeling its to do with some nightmares i have constantly of stuff thats happened to me in school plus a few other things, but since ive been having these and ive been feeling really bad ive hardly been sleeping at all... what is this?