Well, last night I went to bed early and got hardly any sleep. For whatever reason I just didn't get sleepy enough. Taking a nap in the middle of the afternoon yesterday probably didn't help.
On the plus side, no cramps from the Tour class yesterday. Of course I could get them tonight. Sometimes it works that way. But today is my second meeting with Clara and then an Aqua class after that, so if I do get cramps it may not be possible to determine from what.