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ISLAMABAD. — The two brothers have come to be known as the “solar kids” and their case has mystified Pakistani doctors.

Aged nine and 13, the boys are normal active children during the day. But once the sun goes down, they both lapse into a vegetative state — unable to move or talk.

Javed Akram, a professor of medicine at the Pakistan Institute of Medical Sciences, told The Associated Press on Thursday that he had no idea what was causing the symptoms.

“We took this case as a challenge. Our doctors are doing medical tests to determine why these kids remain active in the day, but cannot open their eyes, why they cannot talk or eat when sun goes down,” he said, as he visited the pair at his hospital.

Akram said the government was providing free medical care to the siblings, who come from an impoverished family.

The brothers are undergoing extensive medical testing in the capital, Islamabad and samples of their blood have been sent to overseas specialists for further examination, he said.

Researchers are also collecting soil and air samples from the family’s home village.

He and his wife are first cousins and two of their six children died at an early age.

Their other two children have not displayed any unusual symptoms.

His simple theory: “I think my sons get energy from sun.” — AP.