Pado,

Bullerspoke has done an excellent job in explaining hypnagogia.  My article on it was just posted and you can check it out here:

http://www.skepticalviewer.com/2009/05/24/seeing-is-not-believing/

It's a rather weird personal experience that I had many years ago.  Reading it may help you to see just how real these experiences can seem.  As I said in a previous post to you, I wrote it the night before you posted your story.  I was going to "PM" the story to you so you could check it out, but…it was kind of long for a PM so I didn't.  So maybe it can help you to realize that you really aren't alone in experiencing these types of things.  And they are somewhat normal.  But trust me, I know how "real" these experiences can seem.  My own story bothered me for years until I figured it out.