Don’t laugh at “sleeping under the seats”.
While in the USAF, (1966) my wife, young son, and I were flying back to Tachikawa Japan from Travis AFB in a Canadian CL-44. Only passengers, no cargo.
Around 0200 local time, my wife woke me and asked where our son was. Huh? He couldn’t walk yet, but somehow he slipped out of his baby seat, and was GONE. Was I dreaming this?
I looked all around us, even under our seats ---- no son! I went to the back of the cabin and asked a Flight Attendant to help me find my son. She looked a bit perplexed but as she looked at other seats, I crawled on the floor looking under EVERY seat, hoping someone didn’t raise an alarm about some PTSD weirdo looking at everyone’s legs under the seats.
Alas - I finally found him asleep on the floor, about 12 rows forward of our seats on the Port aisle under the second seat in.
I’m glad to this day we weren’t on a B-747 or DC-10.