Everybody is born with a twin sister called death. When the body is born, death is born along with it. Whether we die today or after 100 years, death is certain. So, everyday we are coming closer to our death. Therefore, every night, we should do this introspection: Did I do something to come closer to Krishna today, or move farther away from Him?  Is my japa improving?  Is my mind feeling more peaceful and less disturbed? This is the real meaning of introspection.