Walking around and doing things while still asleep.
Sleepwalking can be scary or dangerous. People who are sleepwalking don't know what they are doing.
Examples:
He is sleepwalking around the house.
Sleepwalking can be dangerous.
The girl is sleepwalking in her room.
The dog is sleepwalking in the park.
Sleepwalking is like being a robot.
I saw a movie about sleepwalking.