night walkers

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
NIGHT WALKERS. Persons who sleep by day and walk by night 5 E. Ill. c. 14; 
that is, persons of suspicious appearance and demeanor, who walk by night. 
     2. Watchmen may undoubtedly arrest them, and it is said that private 
persons may also do so. 2 Hawk. P. C. 120; but see 3 Taunt. 14,; Ham. N. P. 
135. Vide 15 Vin. Ab. 655; Dane's Ab. Index, h.t. 
    

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