Sleep walking

Once or twice a month my husband does something really weird in his sleep. It is usually in response to a dream he is having. One time it was standing on the bed to catch the ceiling fan he thought was falling on me (he was standing up with his hand in the fan). Jumping on me to protect me from something, yelling, and last night he literally sprinted out of our room into the hallway. I am starting to fear that he will get hurt during these episodes, he could have easily fallen down the stairs last night. We don't see any pattern with food or illness that triggers it. What should we do?