To walk around and perform actions while you are asleep, without being aware of what you're doing.
Compound of 'sleep' and 'walk,' combining two simple concepts to describe a bizarre human behavior. The term became common in medical literature in the 1800s as doctors studied sleep disorders.
Your brain during sleepwalking is in a weird hybrid state—parts of it are awake enough to control movement, but the parts responsible for consciousness and memory are completely offline. It's like your body is running on autopilot!
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