Steve woke up feeling very down. He does not have an appetite to eat breakfast nor he doesn't want to go to work. He feels there's no sense in going to work or even doing anything else. He just wants to sleep the whole day. He has been feeling this for the past 3 days. Steve tried to report for work and do the tasks assigned to him, but he seems to get things wrong. The quality of his work is not the same as it used to be.