Somnambulism
Defined in 2 dictionaries — Ballentine's (1916), Black's (1910)
Ballentine's Law Dictionary
James A. Ballentine · 1916
The act or habit of walking in one’s sleep.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
Sleep-walking. Whether this condition is anything more than a co-operation of the voluntary muscles with the thoughts which occupy the mind during sleep is not settled by physiologists. Wharton.