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?

According to an annual poll conducted by the National Sleep Foundation, in 2005, 75 percent of Americans experienced sleeping problems ranging from minor and transient to severe and chronic. That is up from 62 percent in 1999, when the NSF first conducted its poll.
Question: What percentage of Americans had sleeping problems in 1999, based on the NSF research?