“Also, Chabad weren’t the only ones not to sleep in the Sukkah, neither did Belz before the war. In a shmuess between Rav Shterenbuch of Antverpenn and the Satmar Rebbe of KJ, the latter says: “In Dzhikov one did not sleep in the Sukkah. If somebody happened to doze off in the Sukkah he would be awakened, so that he not transgress… They would wake him by saying: “Nu, Sukkah…”
But of course, if they aren’t Lubavitch, their Minhag doesn’t bother anyone…”
I wrote this 10 days ago, and it seems to just prove what I said about non Lubavitch minhagim not bothering anyone, it was barely noticed. From the above quote from the Satmar Rebbe, we see very clearly how the Dzhikov Chassidim very very makpid to sleep out of the Sukkah, Ad Kdei Kach that one was woken up if he fell asleep in the Sukkah. Clearly, there’s more at play in their Minhag than Tzaar of cold etc, and very possibly they had the same reason as Lubavitch does.