Types of Insomnia. There are two types of insomnia: primary insomnia and secondary insomnia. 1  Primary insomnia: Primary insomnia means that a person is having sleep problems that are not directly associated with any other health condition or problem.
System of a Down's music has variously been termed alternative metal, nu metal, hard rock, progressive metal, thrash metal, art rock and avant-garde metal.
Toxicity is the second studio album by the American rock band System of a Down. The album was released on September 4, 2001, by Columbia Records and peaked at number one on both the Billboard 200 and the Canadian Albums Chart.