People who sustain a concussion or a more severe traumatic brain injury are likely to have sleep problems that continue for at least a year and a half.

A federal appeals court has affirmed an NFL settlement with retired players that could cost the league $1 billion to handle brain-injury claims over the next 65 years, rejecting appeals from players who disagreed with the terms of the deal.

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Retired soccer player Brandi Chastain, who became a superstar when she scored the game-winning goal for the U.S. in the 1999 World Cup final against China, says she will donate her brain to science.

Actor Will Smith says at first he was conflicted about his latest movie, Concussion.

"I'm a football dad," he tells NPR's David Greene. "[I] grew up in Philly with my Eagles, and there was a part of me that did not want to be the guy who said playing football could cause brain damage."

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Wearing a green Dartmouth College jersey, the newest player on the school's football team readies for action during a preseason practice. The whistle blows, he makes his move and then is thrown to the ground by a teammate's crushing tackle. This happens again and again and again, but every time, the new player pops right back up, completely unhurt.

This player is an MVP — a "Mobile Virtual Player," that is.

Heading the ball in soccer has been accused of causing most concussions. But the hazard may be more due to rough play than to one particular technique, researchers say.

The risks involved in heading — when a player uses their head to keep the ball in play — are not new. But Dawn Comstock, an injury epidemiologist at the University of Colorado's School of Public Health, wanted to know if headers are indeed the chief cause of concussions.

A judge has given a final OK to an agreement that settles injury claims by former NFL players against the league.

The settlement, which pays medical and other benefits to players who suffered concussions and related injuries, could cost the NFL up to $1 billion over 65 years, the AP reports.

The wire service adds:

"The NFL expects 6,000 of nearly 20,000 retired players to suffer from Alzheimer's disease or moderate dementia someday. The settlement approved Wednesday by a federal judge in Philadelphia would pay them about $190,000 on average.

Concerns about possibly incurring brain injuries have prompted Chris Borland to end his NFL career after just one season, during which he emerged as a star on the San Francisco 49ers' vaunted defense. Borland, 24, said, "I just honestly want to do what's best for my health."

Saying that he had consulted with other players, medical experts and his family, Borland stated, "From what I've researched and what I've experienced, I don't think it's worth the risk."