The phone radio is using 80% of the battery usage. that tells me that you have a weak signal, and that's causing the drain. (If the received signal is weak, it's assumed that the phone's signal at the tower will be weak, so the phone radio is transmitting at, probably, its highest power.)
Either you put the phone down in a dead spot at night (and a dead spot can be a few inches in diameter), or you're using the wrong carrier. Install
LTE Discovery and see what the signal strength is. (The number should be 100 or smaller - it's a negative number, so the smaller the number, the stronger the signal.)