Which country is possibly involved in the attack?

American media say the United States is investigating possible Iranian involvement in a recent attack in the Iraqi city of Karbala. Five American soldiers were killed in the attack. The media are reporting comments of unnamed United States government officials.

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.