nittel nacht is a minhag that trumps the biblical obligation to learn Torah.
In Lubavitch the minhag is to recite all the morning benedictions, with exception of Asher Yatzar, even if one did not sleep at night, although it says in Shulchan Aruch not like this.
halacha says you have to sleep in the sukkah, but the minhag is….
halacha says you should ideally wash for shalosh seudos, but the minhag in lubavitch is…. (with exception of yesterday, where the minhag was to wash for the Moshiach seuda).