When I was last in an office full time, commuting on the train a few years ago I'd usually be the first in my team to arrive, and then first to leave - basically trying to do 7:30 to 4 but I'd generally be pretty useless for the last couple of hours of the day.
Followed by a nap on the train.
e.g. put your backpack on your lap against your chest and cross your arms through the straps, stick your leg through the loop of a duffel bag handle, etc
M5x7wI3CmbEem10, I first thought you were worried about sleeping too long, getting off at the wrong station
I suppose it's getting robbed? And that you live in a quite different part of the world than me :-/
America.
Ok, I'm in western/northern Europe.
(wfh definitely helps with this but even before that, I kept odd/hard to track hours and no one ever questioned me)