I hit the wall today.
Had a little bit of insomnia last night and that, on the heels of a hectic week, did me in.
I barely woke when my family did this morning and went back to sleep until 11:30. I spent the day in my pajamas, dressing only in time to walk the dog and pick up my son from school.
I used to push myself way past exhaustion. I can't do that any more.