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Webster 1913 Edition

Noun.

[L.

somnus

sleep +

ambulatio

a walking about, from

ambulare

to walk. See

The act of walking in sleep, called also

sleepwalking

Noun.

[L. somnus, sleep, and ambulo, to walk.] The act of walking in sleep.

somnambulation ‎(countable and uncountable, plural somnambulations)

(rare) The phenomenon of sleepwalking.
He is known for his somnambulation, as well as his vivid sleep-talking.
(rare) An instance of sleepwalking.
He broke his arm on one of his many somnambulations.

sleepwalking — see sleepwalking