poessed or sleepwalking? Please help I'm scared

Hi, I am a 29 year old female and recently my fiancé has told me things I have done in my sleep in the last 6 months. They include standing in a corner facing the wall and looking down, when he asked me what I was doing he said I yawned and said "nothing" and went to bed. Then another one is where I sat up in bed staring at the wall with no expression and he asked me what I was doing again and I just looked at him and laid down. Now here is the scary one...He woke up with me straddling him bent down low enough to have my face just inches away from his with my hair in his face and he woke up and said I was staring at him with a blank expression on my face then he rolled me over and shook me and asked me what I was doing and he said I blinked a couple times and irritatedly said "I'm trying to sleep" and I rolled over and went to sleep....I don't know what this is please help me out....what is this called??