A "body" touching my body?

[wow_nonamesleft]

Weird title...dont know what to lable it as  .
A few months ago, I was sleeping face down on my bed... while I was sleeping, I felt like "someone/something" go on there knees on the outside of my legs (which were together) and then hands go between my armpits(which my arms where touching my sides), which infact tickled me. I woke up right after the tickling, and no one was there. What do you guys make of it?  I believe my sister was home, Im sure I mentioned it and she got worried, its also something she wouldn't do.

edit: I was thinking it would be like my astral body, but I dont remember actually projecting, not even sure if I even projected by then.

[knightlight]

I get something like this atleast once a month.  Its something I've learned to live with.  I have come to the firm conclusion that it is either mischevious AP'ers passing through and having a laugh or as you stated our own Astral bodies.  Any way you dice it I've had no adverse effects from it and would probably get bored with life if they stopped.  Atleast I have something to contemplate when I wake up from it dispite how horribly terrifying it can get at times.