If I'm not passing out then what is happening?

If I get hammered on alcohol, sometimes I repeatedly go limp. From the outside, it probably looks like I'm passing out because I just close my eyes and drop to the ground. But... I'm fully conscious. I can't open my eyes to look for anything to grasp onto but I can feel around with my hands and hopefully grab onto something so I don't fall flat on my face.

When I say "repeatedly" I mean I'll go limp, then regain control, and go limp again, over and over, several times per minute.

Sometimes I snore, still, fully conscious and I remember it all.

If I'm not passing out, then what is happening?