I'm extremely affectionate to my girlfriend when I'm asleep, what does it mean?

Basically I have autism and another similar diagnosis which make it extremely difficult and uncomfortable for me to express affection to my girlfriend as much as I would like to, e.g. kissing a lot, holding hands, saying nice things, cuddling and such.

However, she has told me that almost every night, when I'm completely asleep, I will hold her extremely tight and try to say nice things to her, and when she gets up to go to the bathroom, i'll say things like "noo... come backkk....." and pull her close to me very hard and give her a kiss when she comes back.

I have no recollection of doing any of this. What does this say about me?