Some call it the "amenities arms race," some "the battle of the beds."

It is a competition in which the nation's premier hotels are trying to have their accommodations resemble royal bedrooms. Superthick mattresses, plush duvets and decorative bed skirts have been added, and five pillows rather than the pedestrian three now rest on a king-size bed. Hilton markets these rooms as Suite Dreams, while Westin boasts of its Heavenly Beds.

The beds may mean sweet dreams to hotel guests, but they mean pain to many of the nation's 350,000 hotel housekeepers. Several new studies have found that thousands of housekeepers are suffering arm, shoulder and lower-back injuries.

"It's gotten harder," said Dolores Reyes, a 55-year-old housekeeper responsible for 16 rooms a day at the Hilton Hawaiian Village in Honolulu. "I've been trying to get my body used to it, but instead I'm feeling more pain. I've had to go to the doctor about my shoulders. That's what's killing me right now."

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