Do you take any medication at night? That would be my first thought. People sometimes sleepwalk, you might have to put some type of pressure sensitive alarm on your bed that will wake you up if you get out of bed asleep. Definitely let your doctor know you are doing this.
Speak to your doctor as sleepeating has similarities to sleepwalking, however most people tend to eat food :) In the meantime keep inanimate objects away from your reach at bedtime and check you have a good sleep routine.
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