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.
Down in the Valley , also known as  Birmingham Jail , is a traditional American folk song. It has been recorded by many artists, and is included in the Songs of Expanding America recordings in the Burl Ives six-album set Historical America in Song. It is a ballad played in the 3/4 time signature. Lyrics vary, as with most folk songs. For example, sometimes the line Hang your head over, hear the wind blow is replaced by Late in the evening, hear the train blow.