I had something similar happen and DH told me -- even though you thought you were awake you were asleep. All I could think of is 'oh no I wasn't -- I was FULLY aware of what was going on' That was at least 18 years ago but I can remember it like it just happened & I tend to forget what I did 5 minutes ago.
I was sleeping, woke up and could NOT move, it was the scariest feeling, then I went to say something and literally no voice or anything. I immediately thought this is how people in comas must feel, fully aware but can't get others to know that. I literally just forced myself to scream which took all my effort & nothing came out until finally my voice squeaked (even though in my head I was attempting to scream at full force) and then I was able to move and things were back to normal. It freaked me out. I told DH about it as it was early on in our marriage and he just went "oh you were sleeping even though you thought you were awake" -- I was thinking you are an idiot, I was NOT sleeping...I do NOT sleep and remember things like that nor feel fully awake and know where I'm at, etc...
Thankfully it has never happened since but it still freaks me totally out to this day.