Tired Monday

I got a note from Marly yesterday saying how exhausted she felt. I think it's contagious. Today my legs feel like rubber. I can hardly keep my eyes open. Unfortunately, I have choir practice tonight, and am pondering whether I should stay home and sleep, given that I have two classes to teach tomorrow, one at 7:30 and one at 4 PM. Maybe I'll just go to dinner with the choir and then come home? Or maybe I'll just stay home completely!