I’ve never stayed at BLT, just CR, so it is a tiny bit further from the fireworks, but I’ve never had a problem with noise from fireworks if we were on the lakeside of the tower. You do tend to hear the booms on the theme park side, but different kids (people) can sleep through different things so ho disruptive they are can vary. I will say that at 10 pm the noise of the electrical water pageant (music) travels up to the lakeside view rooms in CR. The BLT might be a little further from the spot on the lake where it parks. Generally a white app or something mitigates most of the noise.