Thanks mickycheeky, I was wondering that earlier (some 2 months ago) (btw... I have this brp9blem of intru.. from 1 and a half month), I used to learn things in a single time and that used to put some load on my brain. After a month I was not able to get enough sleep (due to waking up early for some reason), I THINK that bcoz of less sleep and load in brain this thing has happened to me. But it could be false. Can anyone tell me how can I get cured of this?