There is a tired → grumpy → tired → etc. loop that I need to write more about and recognize. Here’s a quick take: If I am tired, then I find I don’t have the energy for some tasks. But my default setting is do-do-do, so then I get grumpy about not accomplishing things, especially if I feel like I have no right to be tired. But trying to think my way out of these things with a tired mind makes me grumpier and more tired.