To put it simply, you hadn’t been feeling well. You are exhausted and achy with a terrible fever. Izuku, Ururaka, and Iida came to check on you. After you ended up collapsing, making Ururaka have to catch you since she was closest, they called down the rest of the class to your dorm.

That’s when it was decided. Class 1-A was going to have a sleepover/movie night at your house to help take care of you for the night

(Mineta was excluded from this without question, sorry not sorry)