Weird & idk if this is normal

So I apparently had my eyes open for about 30 minutes . I was staring at my boyfriend . I thought i was asleep but my eyes were wide open. I wasn't talking , neither was he . I was staring into space. At him though. I don't remember having my eyes open for no longer then 2 minutes and thats when i woke up completely.

I didn't even realize he came home from work . He was just sitting there rubbing my arm just looking at me (in a non creepy way, we had an argument and he came home and we were both still upset)  . I have never done this before. I thought when i got up to go pee he had just gotten home but i asked him and he said my eyes were open and he has been home for like 30 minutes sitting with me. I have slept walked, slept talked, but this is taking it to a whole another level. This is so weird to me and creepy that i did that. He didn't even know i wasn't awake completely . I didn't drink, smoke or take any pills to have this happen. I did cry alot before i fell asleep but im pretty sure that had nothing to do with it. 

Anyone know why this happened ? What could trigger it? Anyone had similar expieriences? 

Any stories .

I'm completely freaked out about myself doing this.