The original hypothosis - E= DV2
But do to a couple of people who know physics too well, they shot down my theory. So I came up with a much simpler philosophy.

It seems to me that it is apparent that (OBE's) Out of body expirences are more commonly known than (HH) Hynopompic Hallucinations.
I have known several people claiming to have had OBE's. They claim to feel like they are leaving there body, obducted, glued down or visited by whomever.

I have had this expirience myself.
This is my conclusion (for today at least )
Opon awakening, you are in a stage of sleep paralysis. which is then accompanied by a similar state of HH.
Because your mind has no control over your body and you are in more of a heightened stage of awaerness, your mind does not except the fact that it cannot control your body do to SP. It then conjurs up hallucinations of the typical OBE experience. Thus of coarse having many variables depending opon what that indiviual already knows of the process, what he believes in and what was going through his/her mind at the time.