Sleep walking

Taylor went to Tammy's (babysitter) on Monday for the day. When I went to pick her up, Tammy said, "Has this ever happened before?....." That is not the question you want your babysitter to ask you when you go to pick up your kid. She said that during nap, Taylor was sound asleep and then all of a sudden jumped up out of her nap mat and started running around the house. She said she would tell Taylor to go lay down and Taylor would look at her and then just keep running around the house. She said it only lasted a few minutes, but was crazy. Now I am worried about Taylor sleeping upstairs. We've put the gate up at the top of the stairs, just in case she sleep walks again. Hopefully this won't happen again.