Since I'm not familiar with shift work or cases, I was speaking from my experience doing scheduled frequency visits only.
As Caliotter says, it is very likely to be different with shift cases, and I could understand why, if the pt. needs a nurse in the home 24/7.
So it would depend on what kind of HH you do.. visits, or actual shifts.
Wouldn't hurt to check with your agency anyway, just to know should this come up.