Oh yes peregrine
that DOES happen. It is not something I can predict. But sometimes I feel physically weak (lacking some stamina), and sometimes emotionally weak (unable to do some of my emotional-body-exposing poses to the same extent).
Observe, breathe, and do what you can! Also recognize if you think it is related to your nutrition (by checking on hydration, electrolytes, food) and your frequency of practice (I don’t mean too often, maybe too seldom can be a problem too!).
Namaste
Gabrielle:)