I flew long haul extensively from 1986 until 2002. When advancing auto pilot & take off/landing technology came into being on 747’s, I was reliably informed that it was common practice for the guys at the front end to fall asleep & that cabin crew were under instructions from many pilots to check once an hour & half hour before landing that someone on the flight deck was actually awake so it's nothing new!
This wasn't a long haul flight though. It should only have been 40-50 minutes duration...