This was nothing unusual in the 80s (and probably in the 70s as well), when I was doing it especially before the Herald disaster. As toby has said, sometimes you could be so knackered you wouldn’t be bothered about food, duty free etc. Just get on, hang about in the cab for a bit then jump on the bunk for a hour or so sleep.
Yes, it used to cross my mind now and again regarding what would happen in case of fire, sinking etc but by then I would be asleep! 