Sleepwalking is walking about while still asleep. A history of sleepwalking.
It is commonest in children and usually stops by itself. Waking a sleepwalking person is not dangerous, whatever the old warning says, though it is confusing for them.
1nounsleepwalkingWalking about while still asleep.
“The sleepwalking stopped at about eleven and never came back.”
sleepwalking is a condition.
sleepwalk comes from sleep + walk.
Etymology from Wiktionary, CC BY-SA