6 year old male dog peeing at night?

I have a 6 year old male dog who has been housebroken his whole life exept about a week ago, at night, he would wake up at night and pee on the same rug in our bathroom at night. we tried letting him go before bed and somtimes at night but that didnt work. we closed the bathroom door and that worked for a bit but he repeatedly began peeing on a diffrernt rug in the hallway hes never been like this so im wondering what the cause of this is?