I leave my phone on. I have elderly family that I care for and some neighbors that might need help too. Sometimes they do call, so I'm glad I have it with me. I've had people I could depend on too in the middle of the night when I needed it, so it's my turn to pay it forward. I sleep better having my phone with me because I know I can react to emergencies.
I'm surprised you all don't have your phones on and accessible near your bedside, if not in your bed beside you. What if you need to call 911 because someone's breaking in or you start having chest pains?