Two brothers from Balochistaninfo-icon province of Pakistaninfo-icon are suffering from an odd sickness - they get activated with the sunrise but almost fainted with the sunset.

Shoaib Ahmed, 13, and Abdul Rashid, 9, have come to be known as the "solar kids" because of their mysterious disease that has confused Pakistani doctors. 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, talk and even open their eyes; their brain stops working. Mohammad Hashim, the father of the two brothers, told AP he has his own simple theory on his sons' case: "I think my sons get energy from the sun."

Both siblings were transferred to the Pakistan Institute of Medical Sciences (PIMS) for treatment. According to Dr. Javed Akram, a professor of medicine at PIMS, the government was providing free medical care to the boys, who come from a poor family. At PIMS a team of 32 medical experts started their efforts to find out the real cause of this odd syndrome. The doctors at Lahore and Islamabad have completed the series of almost 450 clinical tests on the two "solar kids" and have succeeded in locating the cause of the disease from which the two children are suffering, Dr. Akram told Daily Times. The experts diagnosed boys with muscular fatigue.