Of the category of euphemism known as indirection, euphemistically identifying the lavatory as a place where one rests.
Restroom Sentence Examples
"I'm going … to the restroom," she said, heart thudding in her ears.
Could I possibly use the restroom first?
It resembled a studio apartment with a real bed and dresser, a restroom cordoned off by opaque curtains in one corner, a small study where he kept his war docs, a kitchenette, rugs, and a small living area.