Somewhere it is said that man cannot exist without sleep for more than a stated number of hours. Quite wrong! I had been convinced that there were certain things I just could not do: I could not sleep without this or I could not live with that or the other. The first night in Auschwitz we slept in beds which were constructed in tiers. On each tier (measuring about six-and-a-half to eight feet) slept nine men, directly on the boards. Two blankets were shared by each nine men. We could, of course, lie only on our sides, crowded and huddled against each other, which had some advantages because of the bitter cold. Though it was forbidden to take shoes up to the bunks, some people did use them secretly as pillows in spite of the fact that they were caked with mud. Otherwise one’s head had to rest on the crook of an almost dislocated arm. And yet sleep came and brought oblivion and relief from pain for a few hours.

I would like to mention a few similar surprises on how much we could endure: we were unable to clean our teeth, and yet, in spite of that and a severe vitamin deficiency, we had healthier gums than ever before. We had to wear the same shirts for half a year, until they had lost all appearance of being shirts. For days we were unable to wash, even partially, because of frozen water-pipes, and yet the sores and abrasions on hands which were dirty from work in the soil did not suppurate (that is, unless there was frostbite). Or for instance, a light sleeper, who used to be disturbed by the slightest noise in the next room, now found himself lying pressed against a comrade who snored loudly a few inches from his ear and yet slept quite soundly through the noise.

If someone now asked of us the truth of Dostoevski’s statement that flatly defines man as a being who can get used to anything, we would reply, “Yes, a man can get used to anything, but do not ask us how.” But our psychological investigations have not taken us that far yet; neither had we prisoners reached that point. We were still in the first phase of our psychological reactions.

— Man's Search for Meaning by Viktor E. Frankl