Happened to me once at the Westin Palace in Madrid. The couple next door were, let us say, amorous all night long and she was extremely, and I mean extremely, noisy . And they didn't stop the whole night. I tried knocking on the dividing door a couple of times and it quieted them down for a few minutes but then they quickly resumed. I didn't sleep a minute. Finally at around 4 AM I gave up and went to the gym.