Wikipedia:
Computer addiction, a loosely used term with Internet Addiction, or Video game addiction, is the excessive or compulsive use of computers that interferes with daily life. This disorder may affect the following: social interaction, mood, personality, work ethic, relationships, thought process. It may also cause social disorders or possibly sleep deprivation. It is important to note that as of now, psychologists are not sure how to label this disorder. Many refer to it as Internet Addiction Disorder; however, computer addiction originated long before internet use is as common as it is today. In addition, the Diagnostic and Statistical Manual of Mental Disorders has yet to recognize this exact disorder, and are more likely to include a more specific term of addiction, such as Internet Addiction, or Video game addiction.
Some people develop bad habits in their computer use that cause them significant problems in their lives. The types of behavior and negative consequences are similar to those of known addictive disorders; therefore, the term Computer or Internet Addiction has come into use. While anyone who uses a computer could be vulnerable, those people who are lonely, shy, easily bored, or suffering from another addiction or impulse control disorder as especially vulnerable to computer abuse.
Computer abuse can result from people using it repeatedly as their main stress reliever, instead of having a variety of ways to cope with negative events and feelings. Other misuses can include procrastination from undesirable responsibilities, distraction from being upset.