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.
System of a down is a Nu-Metal band..like slipknot.. by any stretch of imagination it can not be any of the above ,,,,,it is none other than chrome finish metal ,with embossed rivet on leather. no way not even close. it is heavy metal/ funk metal/ hardcore punk all in one.