Wiktionary assures me it means 'Walking or wandering in the nighttime'. And from the 17th century, no less. · 11:50pm Aug 31st, 2015
Noctivagant, now with actual words inside and published to all and sundry! New horsewords seemed overdue, and this particular one had been dragging its heels for a while. Expect serial updates as and when chapters are completed. Kick me up the arse for them if they don't manifest in due course.