The inspector general reported that some detainees were injured because they fell off those bunks.

NPR: Immigrants Held in U.S. Often Kept in Squalor

Then, as soon as plastic trays and silver foil have been spirited off to kitchen quarters unknown, our attendant transforms our chairs into two neat - if narrow - bunks, fitted with crisp white sheets and jaunty tartan blankets.

BBC: Travel with children: The night train to Luxor