Why were the Iraqi detainees made to pick up garbage?

Germany—The commander of three British servicemen accused of mistreating Iraqi detainees testified Friday that he told soldiers to make their prisoners "work hard" picking up garbage but saw no abuse. A Danish army captain and four military police sergeants, meanwhile, were formally charged with mistreating Iraqi detainees at a military camp near Basra last year.
Question: Why were the Iraqi detainees made to pick up garbage?

Foucht is one of an estimated 60 million Americans who regularly suffer from insomnia, either because they are taking medication, or experiencing pain, or not eating right. Or according to Russell Rosenberg, who directs the Sleep Medicine Institute in Atlanta, Georgia—simply because they are living in the modern world.
Question: According to Russell Rosenberg, why do many Americans suffer from insomnia?