This market resolves YES if Donald Trump ever spends 1 full night locked in a prison cell.

Note this is about Trump ever spending even one night in PRISON anytime in the rest of his life.

For definitions, I'm going with Merriam-Webster here:

PRISON: “a place of confinement especially for lawbreakers”
JAIL: “a place of confinement for persons held in lawful custody”

A "full night" is defined as the time period between 10:00 PM and 6:00 AM, in whatever local jursidiction he's in.