noctambulist

noun
noct·​am·​bu·​list | \näk-ˈtam-byə-list \

Definition of noctambulist 

: a person who walks while asleep : sleepwalker

First Known Use of noctambulist

circa 1731, in the meaning defined above

History and Etymology for noctambulist

New Latin noctambulus "sleepwalker" (earlier noctambulō, with -ōn-, -ō, agent suffix, from Latin noct-, nox night entry 1 + -ambul-, noun derivative of ambulāre "to walk") + -ist entry 1 — more at amble entry 1

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The first known use of noctambulist was circa 1731

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