Believe me, 4 hrs a night is going to overwhelm you fast. been there done that I would try to prioritize what HAS to be done with what needs to be done with the most important at the top of the list. If while things are chaotic you only manage to get the most important things done, well the other stuff ain't going anywhere. It's going to be there when you have more time.
If you don't take care of yourself, no one will. And if Mom ain't happy, no one's happy.
Hugs