During a Deathzone's excursion, one did not simply spend the night camping. There was no luxury of building a tent since they might have to run away any second, so all they did was find a considerably safe place and sleep on the ground over a coat or blanket. Half would sleep, and half would watch the surroundings. Just one or two people wouldn't be enough; at least four people for each cardinal direction were needed for night watch, unless they found a cave. Even then, at least one person to watch the exist and another one to watch the inside of the cave was needed.
Naturally, the clients would always be the resting ones, and the Borderland personnel would be on the night watch.