Children of the Night

I know what this is, but how did it come to be called this?

My guess is that her visitors would stop by in the late evening, under the cover of darkness.

More commonly called a "lady of the night" here in the UK.

A 'lady of the night' could be a succubus or an incubus...

(In Amsterdam the other kind of 'ladies of the night' work in daylight - that must confuse them)