When my husband and i were first married, we were broke - with a baby. Once a week the local theater had dollar movie night for a 9PM showing of popular new releases.
We would bring our daughter and she would sleep through the whole thing in her car seat. We finally had to stop when she was about a year old. She wanted her bed, not a car seat and would fuss. That was the end of it.
I remember my mother taking me to the late showing of movies until I was seven. She would bring a sleeping bag and a pillow and I would sleep on the floor. (It was the 70’s. People were a lot less picky back then.) Of course, placing a child on a dirty movie theater floor (even with a sleeping bag) would be horrifying now; but back then, it was no big deal.
I slept just fine through Dirty Harry.
Fortunately, an inebriated movie patron did not step on your head on the way to the restroom. Otherwise, emergency evacuation regulations would prohibit this from occurring today, spoiling all the fun for sleepy kids at nighttime movies.