Hey, Whatsitthingy.
Teacher who does lots of residentials here.
We supervise the kids all day. Then we pop them into shared hotel rooms which usually accommodate 3-4 kid. Mostly hotels that are set up for the student market have bunks, but some Travelodge types have a twin room plus a sofa. It's basic & that's reflected in the price.
Teachers split into shifts with one lot keeping an eye on hotel corridors until after midnight/whenever all is quiet, & the other shift free to go to bed but up at 6am.
But no, no one is supervising 'dorms'. Students who are quietly spending the night in their rooms, in friendship groups, are not 'supervised' unless they flag up a problem.
Probably not great to room four 14yos together if one of them is of the opposite sex to the other three, but if that's how it's roomed, then once they close the hotel room door, there is absolutely NOT going to be an adult 'supervising'.
Hence the concern.
If you're imagining massive sex segregated dorms with patrolling staff, then nope - it's not The Handmaid's Tale. It's a dc with 3 other students from their year group, in a smallish double hotel room with bunks or fold out beds.