When attempting to sleep, I have the urge to urinate every 1 1/2 hours. I travel to the bathroom and urinate a moderate amount, then return to the bedroom to have the same thing occur over and over. I drink two 12 oz beers between 3 and 4 in the afternoon and have two cups of caffeinated coffee at 6, then no more liquids after that. I try to go to sleep about 11. My medications are levothyroxine, metoprolol, lovastatin, and warfarin, prescribed for the treatment and maintenance of a prosthetic aortic valve and I have a pacemaker. This frequent urge to urinate at night has been on going for some time. I do not have the same urge during my waking hours and am concerned about whether it is something to seek treatment for.