This man has been looking at this clock all morning.
And as far as he can tell it hasn't moved. What is he doing?

Sometimes people with depression feel like they can’t do anything. The world just grinds to a halt. All they see is endless hours. Hours of doing nothing. Hours of feeling nothing. Hours of being nobody.

If this gets really bad, he might stop eating and drinking. He could even just turn his face to the wall and die. Fortunately there are effective treatments for this.