These Boys Are Only Active During The Day When There's Sunlight

I have only heard of solar machines, like laptops, flashlights and the rest, but to know that some people function by the rays of sunlight makes me wonder.
Two brothers from Pakistani Shoaib Ahmed and Abdul Rasheed are suffering from a mysterious condition that has left doctors scratching their heads. The so-called ‘Solar Kids’, aged 13 and 9, are normal and active throughout the day, but as soon as the sun goes down they descend into a vegetative state that renders them unable to move or talk.

Shoaib and Abdul wake up with the first rays of the sun, filled with energy and life. They tend to their house chores, attend school, but they are on a clock to get everything done by late afternoon, because as the sun travels west, their energy levels drop and by the time it sets, they are completely paralyzed until the next day. Their parents say that the boys appeared to be dependent on the sun this since the day they were born, and in their home village they are known as the “solar kids”.