Los Angeles City firefighters Omar Velasquez, center, sleeps as Cory Darrigo, left, and Sam Quan rest in the backyard of home they were protecting after fighting the Woolsey Fire on November 9, 2018 in Westlake Village, Calif.

As major wildfires increase in California, some firefighters are being pushed to the point of exhaustion — and overtime costs are soaring.

(Image credit: Kevork Djansezian/Getty Images)