We get into a tired daze and let the days pass.
We blink and months go by.
I have learned early warning signs to help me catch it: The number of books I read and how frequently. Which people I am seeing, and how often.
Lately, it is having ideas. This is how I know I am too tired: I have no new and original thoughts.
This is precious to me. And if I am too tired to do it, then something needs to change.