Firefighters battle exhaustion along with wildfire flames

Firefighters monitor the advance of the CZU August Lightning Complex Fire in the backyard of a home Friday, Aug. 21, 2020, in Boulder Creek, Calif. Firefighters trying to contain the massive wildfires in Oregon, California and Washington state are constantly on the verge of exhaustion as they try to save suburban houses, including some in their own neighborhoods. (AP Photo/Marcio Jose Sanchez)

Members of firefighters crew walk in line on Sept. 5, 2020 in Yucaipa, Calif. Firefighters trying to contain the massive wildfires in Oregon, California and Washington state are constantly on the verge of exhaustion as they try to save suburban houses, including some in their own neighborhoods.(AP Photo/Ringo H.W. Chiu)

Firefighters rest during a wildfire in Yucaipa, Calif., Saturday, Sept. 5, 2020. Firefighters trying to contain the massive wildfires in Oregon, California and Washington state are constantly on the verge of exhaustion as they try to save suburban houses, including some in their own neighborhoods. (AP Photo/Ringo H.W. Chiu)

BEAVERCREEK, Ore. — They work 50 hours at a stretch and sleep on gymnasium floors. Exploding trees shower them with embers. They lose track of time when the sun is blotted out by smoke, and they sometimes have to run for their lives from advancing flames.