Ipod Sleepwalking?

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I usually listen to audio podcasts on my iPod right before I go to bed. I have been doing this for the past month and last week I have noticed a strange thing happening in the morning. When I wake up, I find my iPod earbuds inside my ears and my ipod resting inside my hand. I am sure that I'm doing this while I'm unconscious, because I always put my iPod inside my bedside drawer when I am finished listening to an episode. This is extremely strange, as my parents can also hear a rumbling noise at around 3 o'clock every night. Have any of you ever sleep-walked? If so, what did you do?