Mobile phones should be switched off just in case calls come through trying to enquire of what should be done and even end up giving you a stressful time. When it is time with your family then you should be available and when it is time for work, same should apply.
Relax and rest as much as possible because your body and mind needs it like I said previously and when you come back to work, you feel fresh and able to perform your duties with a clear mind. You might be passionate about what you do but it has a way to exhaust your mind without you taking note of it.
When you go out there make sure you have fun and enjoy every single moment because you do need it.