Brothers become mysteriously paralyzed each night, unable to speak or move

Nine year old Abdul Rashid and thirteen year old Shoaib Ahmed are normally active children during the day. But after dark the brothers both enter a vegetative state where they are unable to move their bodies or talk.

Doctors are baffled at the boys mysterious condition. Javed Akram, a professor of medicine at the Pakistan Institute of Medical Sciences, told The Associated Press that he is unaware of what's causing the boy's bodies to switch off at night.

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"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.

Click through for photos of the brothers:

Currently, the brothers are undergoing medical testing in Islamabad and researchers are taking air and soil samples from around their home.

Although doctors are confused by the brothers' condition, their father Mohammad Hashim has a theory -- he believes that his son get energy from the sun .

But doctors have dismissed his theory as the boys move fine during the day in dark rooms or when it is gloomy outside.

The brothers' condition remains a medical mystery but the family remains hopeful that the testing will reveal answers to their condition.