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.
Boogie-woogie is a musical genre that became popular during the late 1920s, but developed in African American communities in the 1870s. It was eventually extended from piano, to piano duo and trio, guitar, big band, country and western music, and gospel. While the blues traditionally expresses a variety of emotions, boogie-woogie is mainly associated with dancing.