I have tried WILD and MILD . Both with WBTB and without it . I have stood in bed for up to 3 hours not moving myself . But I have never seen HI . Why ?
All I see is blackness even if Ive spent hours in bed . Random thoughts come in my head and my brain believes I can see them but actually I dont . I cant see anything . Whats wrong ? 
You either don’t relax enough, or you are not tired enough. Try to do an all-nighter if you can, and that will show you some HI.
Also, if you start to think of something and images of that appear insode your mind, that is possibly the beginnig of HI.
What is all-nighter ?
I think I should be tired enough because I have done WBTB many times . And I sont really think that pictures cominging inside my mind are the beginning of HI because I have seen pictures in my mind and waited for a long-long time but nothing changes . I just cant keep my mind of thinking . I go to bed when Im really tired and even if I think Im not thinking my mind repeats "Whoa , Im not thinking . I just thought that Im not thinking . It was a thought . " And keeps me awake all night long .
I have some serious sleeping problems . Every night I go to bed at about 2 am and think that Im going to sleep now and stay awake for more than 6 hours every day . Some nights I dont sleep at all , take a nap for an hour or so and stay awake for another 35 hours .Duh . 
But thank you very much for answering me . 
An all nighter is a night in which you don’t go to sleep. So the next night, you can sleep without problems.
You may think too much about not thinking. Start to think of something if you want to see some definite HI - Either your memories dreams or future plans.
Note that you must be a bit distracted in order to see HI.
I do those all-nighters almost every day . I just cant sleep and stay awake for more than 30 hours when I finally go to bed I either fall asleep really quicly or try to see some HI which I have never seen even when Ive been awake for so long .
So you suggest to think of something at first ? So pictures come to my mind and wait until I can see them in front of my eyes ?
Basically, yes.
That must be quite odd, not to be able to fall asleep for so long…
That is very annoying . Im furious all the time Im awake .
I get the most HI when i am really sleepy, for example after a late shift followed by an early one. Listening to music or mIRC speech while falling asleep makes the half sleep stage longer, and gives more time for HI.