Johnny Manziel: Hits Late Night Hot Spot ... After Cavs Game

Johnny Manziel didn't turn in after the Cleveland Cavs game Thursday night -- instead, he hit up one of the hottest late night spots in town ... TMZ Sports has learned.

Don't worry ... we're told Manziel didn't do anything crazy at the TownHall bar and restaurant in Cleveland ... just hung out with friends and watched some NBA basketball.

We're told Manziel was at the place past 1 AM -- but no champagne swiggin', no shots, no crazy drunken debauchery.

Dude's allowed to go out and enjoy himself though ... right?