The only important thing about this method is to perform it at least 6 hours after sleep when we are not very tired at all. I tried it this morning again. After waking up I closed my eyes immediately and tried to see the wall in front of me with its every details on it like shadow and dust on it. After some seconds I could see the wall behind my closed eyelids! There was also another being in my room.

In this technique if nothing happens after 20 seconds, you should fall sleep and try it after you wake up again as you must be in REM sleep.