This.
The desert is an incredibly inhospitable place.
Imagine the heat inside a tank in daytime...
Indeed, most of the day troops tried to sleep best they could because officers worked them through the night laying mines, patrolling, repairing vehicles, moving supplies, digging fortifications etc.
Problem was not just sleeping in 40 - 50 degrees C either, there was a constant lack of fresh water, especially when wells were poisoned (considered bad sportmanship on both sides, but still happened). They also had to deal with flies, sand getting everywhere and of course serious sun burns.
And being in a tank was unbearable. No air conditioning! These blokes are casually frying an egg on their tank for a propaganda movie!