I have to report that I managed to tear a tendon in my upper leg. To say it was painful is an understatement. For two months I was unable to stand, never mind walk, properly, and for some reason lying down made it worse. So I was sofa-bound for most of that time, day and night.
   On the plus side, I don't remember ever seeing so much of the Australian Open. But I don't recommend tearing a tendon as an excuse for staying up.
   All healed up now. But being extra careful.