About a year ago, Amanda Ponzar’s son stopped being able to fall asleep.

"He would look at the clock, and it would get later and later," she says, but the boy absolutely would not nod off. At first, she and her husband chalked it up to standard kid stuff, a fear of the dark or bumps in the night. But as the problem persisted, they were baffled.

Photo via Ben Francis/Flickr.