noctivagant

Walking or wandering in the nighttime, nightwandering.

[…] I therefore think, Sarah, that the incommensurability of the crime with the effect, completely warrants the supersaliency of this noctivagant delinquent.

"Over the city, the suburb, the slum / He rambled from pillar to post, / And backward and forward, observant, though dumb, / As a fleetly noctivagant ghost."

One who goes walking by night.