What do you look like to other people during astral travel/OBE?

Say I was in the middle of an astral travel or OBE session. What if a member of my family came into my room (im only 15) and saw me? What would I look like to them? Would it just look like I was asleep or would it look like i was in a coma or something? Would I "wake up" if they shook me or yelled at me to wake up or would it seem like I was in a coma? I really want to know so I dont freak anyone out. Thanks to anyone who can help!