Lack of sleep affects proper functioning of human body - Clinical Psychologist If there is anything man cannot do without, it is sleep. Even in the animal kingdom, sleep is very crucial. It plays a very vital role to the well-being of human life. Health experts have continuously insisted that adequate sleep is good for the body. In this special report, Nasira Avagah, asks the number of hours one needs to have in a day. She gathers from a Clinical Psychologist, Dr. Eric Howusu that inadequate sleep can adversely affect functions of the human body. GBC