Small and overactive bladder

Because of a small and somewhat overactive bladder I have some problems in staying dry at night. I of course try to always use the bathroom before going to bed, but still I some times wake up wet in the morning. My matress is protected, so fortunately the only result is a wet boxerbrief and wet sheets. For some strange reason my bedwetting has increased after I started drinking beer about one year ago! Lol