Voice

Last night, during the wee hours, I went to the washroom. As I am really used to walking around in the dark, I didn't turn on the hall lights, I just turned on my bedroom light. After I locked the toilet door and was answering nature's call, I heard a voice call my name. Thinking that it was mum, I didn't answer. I finished up and opened the door. No one was there. Only my bedroom door was opened. Not thinking much, I went back to bed. Today, I confirmed with mum on whether she "followed" me to the toilet and call out my name, she said no. What was that, that I heard? I really don't want to question nor know.