Hi, I have experienced very similar issues to what has been described above.  My 2 year old Yorkie, Lilly, is 100% completely housebroken; but when we get all cuddly at night on the sofa watching TV, she falls asleep on my stomach and releases about 1-2 oz. of urine on me or the sofa.  I'm grateful to see above that there might be drug therapy to help treat it.  I don't want to end our nightly affection-fests.  
