They have a time-honoured and arcane ceremony at two in the morning which is akin to the Changing of the Guards in other cities of the Multiverse, only louder and more obtrusive, involving the Patting of the Pockets, the I'll Swear They Were Here This Morning, and the Stone Me, They Were Here All Along, and ending with the signing-over of keys between the incoming and outgoing porters. Attempts to get them to turn the volume down a bit are regarded as gross insults from people, who while they might know the value of a good night's sleep, have no respect for deeper values such as Tradition.
In The Last Hero and the The Science of Discworld series, the Bledlows are used by Ridcully to prevent Rincewind from running away. (When confronted by a potential act of heroism, Rincewind follows his better instincts by turning and running.} He doesn't get very far before being (gently) restrained by grinning Bledlows, who are noteworthy in that they have succeeded where other, younger, guards with more weapons and attitude have failed. They are, in short, the one body of men whom Rincewind cannot outrun or evade, which says a lot for all the practice they get chasing down students.