Hopefully your father / brother / SO / whoever doesn't need urgent help from you, ever.
I used to always power off my phone at night, until one day at 2am I was in the middle of nowhere needing help from a friend, and he did actually answer the phone. He told me: "if it was the other way around, you wouldn't have helped me". For me it was a life saver, and I could totally see how harder would everything have been if he did like me every night (no one else to call at that moment, before that's asked).
Since then, my phone is kept on and unsilenced at night. If anyone important to me needs my help, I want to be there for them. Not that it's happened ever once in the last 10 years, though :)
I used to always power off my phone at night, until one day at 2am I was in the middle of nowhere needing help from a friend, and he did actually answer the phone. He told me: "if it was the other way around, you wouldn't have helped me". For me it was a life saver, and I could totally see how harder would everything have been if he did like me every night (no one else to call at that moment, before that's asked).
Since then, my phone is kept on and unsilenced at night. If anyone important to me needs my help, I want to be there for them. Not that it's happened ever once in the last 10 years, though :)