Sleepwalking or somnambulism was the act or practice of walking while asleep.
In 2375, Seven of Nine began to sleepwalk due to the proximity of a Borg Vinculum, resulting in several interruptions to her regeneration cycle. (VOY: "Infinite Regress")
In 2376, after Tom Paris was released from Alice's influence, he described his behavior while under "her" control as being like sleepwalking. (VOY: "Alice")