Sometimes it's difficult to resist comparing human beings to computers. A friend of mine who read my last post noted that as we get older, we accumulate more memories and that can cause us to crash like an old Windows installation.
That's why when I have a bad day, I like to take the night off, go to bed early, wake up at 6 am the next morning and go to the gym. It helps me get a fresh start again. I call this process "rebooting."