I stayed up late reading a novel, but was shaken out of it by a shrieking, snarling brawl in the climbing tree.  Two raccoons were fighting -- or at least one was.  The bigger one, making plaintive-sounding noises would approach the smaller angry one, which would attack, snarling, chittering and biting.  The big one would just push on, infuriating the other one even more.  It's the wrong time of year for raccoon courtship, so maybe it was a pair of males fighting - or tough love from a parent driving off a young-un.  Whatever it was, they made a shocking amount of noise and had the whole house up at 1 a.m.