It is a screenplay that Jon wrote and apparently sold.
It is a script adaptation of the Jack Finney novella
by the same name.
It was written for Parmount. The Miami Hurricane, 9/20/96
(source available at Naked
Pictures of Jon Stewart ... Kicking Your Ass).
"The host [Jon] has also optioned the rights to
cult novelist JACK FINNEY's 1977 book The Night People,
about a restless suburbanite who livens up his mundane
life with a series of stylish pranks, and plans to produce
and star in the movie version." Entertainment