Today I am very tired.  It hit me all at once, after lunch.  All of the sudden, I felt like I hit the wall, like I could have laid down under the conference table at work and just gone to sleep.  I tried breathing in some cold air to wake up, but still feel tired.  Now I have to go teach a spin class.  I usually love teaching spin, but don’t feel I have the energy for it.  However, it is too late to call a sub, so off to the gym I go.  Maybe spinning will give me energy, instead of making me more tired.