nightwalker. 1.Hist. A person who suspiciously wanders about at night and who might disturb the peace. • Nightwalking was an example of a “common” offense requiring no specific facts to be asserted in the indictment. 2. A prostitute who walks the streets at night; a streetwalker. [Cases: Prostitution 1. C.J.S. Prostitution and Related Offenses §§ 2–4, 8–13, 17, 21–24.] 3. A sleepwalker.

[Blacks Law 8th]