The importnat thing, in my opinion, is to ignore any manufacturers instructions that have you running the grounded conductor for any load in a different cable from the the ungrounded conductor.
In interior windowless bath rooms I offer the owner a three way switch wired to turn on the night light or the main light depending on it's position. Iknow that a constantly lit night light does use some electricity but some home owners want that feature.
"This alternating current stuff is just a fad. It is much too dangerous for general use" Thomas Alva Edison