Absolutely get all this. I suppose for me over the past few festivals I've been on an early coach home so Sunday night doesn;t tend to go on hugely late after the headliners finish. Certainly not an all-nighter.
I've had so many nights (Sundays at Glastonbury included) where I've ended up trying to chase the last of the fun to ever-decreasing returns.
Not necessarily a hardship in itself (certainly a first world problem) but it's also a ballache. A mate of mine summed it up quite well when talking about holidays: the journey there is all part of the fun, but once it's time to go home that's then just a chore to be completed. As soon as it's done I'm head down and ready to go.
Plus I never get the Tuesday off work, so if I'm not getting home until late afternoon / early evening then I've got no time to chill out and get myself feeling vaguely human again. By the time I'm showered, unpacked and generally straightened out it's time to eat and go to bed before hitting work the next morning.
Completely different scale obvs, but was off site at BDs this year just after 7am and was home before midday. Made Tuesday so much easier.