Wat happened?!? Sleep walkin?

Ok last night me and my sis slept in my moms room. Sis was on the floor. And today my mom said, Did u turn the bath water on last night and i was like NO! I didnt even wake up to go in there i just had a nad dream and woke up and went back to bed. THen they didnt beleive me cuz im known to play around but IT WASNT ME! And it wasnt my sister either. So my mom said she heard it and yelled at my sister over and over to cut her bath water off and she didnt even know wut she was talking about so my mom got freaked out thinkin sumone was in the house.!. OOkkkkaaaaayyyy.....im freaked out and dont want to go to bed now...Sum1 just tell me wat i asked or SUMTHING! Thanks...wow im scared....