I would have to say that the best way to keep your concentration is merely to verbally demand it. Say, "CLARITY NOW!" or something like that.
Hi,
I've been having OBE during many nights. Mostly, I felt I'm no longer in control of my body, and the vibration starts and some kind of nosiy background noise can be heard. Anyway all I could really do while my Astral Projection was flying around my room... then i would soon loose my concentration and come back to my body... I try to go out threw my window, but after that the image became less clear... then soon I was back in my body.
I need a help so I can possibly go on to next step.
THX.