NIGHT SHIFT opens. Directed by Ron Howard. Written by Lowell Ganz and Babaloo Mandel. Likeable comic confection with ex-Fonz Henry Winkler as a nebbish night shift morgue attendant who reluctantly agrees to partner his live-wire new co-worker (a debuting Michael Keaton) on an outrageous pimp/hooker business venture. With Shelley Long.