I was lucky that both mine were clean through the night. Misha slept through from day one, however I was unlucky that Roly used to howl in the early hours to go out. I'm glad that I got up to let him out to the loo, because it meant that he never had an accident in his crate - it did go on for a few weeks. I made sure that I was very careful not to give any attention other than the business of going to the loo, afterwards it was straight back to bed. After tweeking feeding times and activity it helped to make it easier for him to go through the night.