Slight co-worker issue..

Ok so I'm a float; so any given floor any given day is the norm. Lately Ive been floated to a dementia floor with one other float and 3 regulars. The problem seems to be the regular staff, who seem to dissappear when call lights come on and when they see you go into a room of a resident who is an assist x2 or you come rolling down the hallway with a hoyer lift. During breakfast and lunch they dissappear, so myself and the other float are busting it out consistently. It wouldnt be so bad if these staff members at least did their assignments but they dont and most of their residents get passed onto myself or the other float. This issue was brought to the attention of the nurse who just basically shrugged and said, "I'll talk to them". If she does, it doesn't seem to help because the situation stays the same. So my question is how do you work effectively when you are surrounded by laziness and lack of leadership? Does anyone have any experience with this and how do you deal with it?