I used to go for days without shaving, when I was really depressed, (I think that's why I grew the beard I have now) but I still showered and kept myself clean. I think that goes back to my days in the Navy, where personal hygiene was important.
As there was thirty to forty blokes, all living in one small place, where our pits (bunks) were only inches apart.
Our bunks were stacked three high, and there was hardly any room to turn over in your bunk, and you have someone else's feet just inches from your face?
When I was on the Yacht we slept in hammocks, and that was an experience! They were so close together, that if you got up to go on watch, you couldn't get back in again.
As it was impossible to hold the ones nearest to yours apart, and swing up the seven feet, to get into it, at the same time ?