John Harsh at the University of Southern Mississippi in Hattiesburg and his colleagues asked the parents of 738 children aged between 2 and 12 about their children's sleeping habits.

南密西西比大学John Harsh博士和他的同事们询问了738名2至12岁儿童的父母，了解他们孩子的睡眠习惯。

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Hattiesburg is home to the University of Southern Mississippi.

CNN: Tornado tears through southern Mississippi

Hattiesburg, which straddles Forrest and Lamar counties, is home to the University of Southern Mississippi.

CNN: Tornado tears through southern Mississippi