IMAGINE THAT ONE NIGHT you put your bright, athletic, well-adjusted 8-year-old son to bed, a kid who loves playing baseball and cracking jokes and scarfing down chocolate chip cookies. The next morning, he wakes up as someone entirely different, and in subsequent days turns into someone unrecognizable.

He’s manic, spending hours doing sit-ups or running laps on the driveway — unwilling to sit down even for a minute. He alternates between tears of soul-crushing sadness and tantrums of rage directed at you and your spouse. He’s obsessed with the unhealthiness of food, refusing to eat or drink much of anything. More than anything, though, all the comforting touchstones of his life — home, school, even sleep — have suddenly been transformed into dangers. He seems trapped in a horror movie, his fear unmistakable in the way his pupils have overtaken the irises of both his eyes.

As this bizarre behavior continues, you find yourself staring at your formerly normal, healthy son and you can’t help but wonder, Where did my boy go? You ask yourself: Is this what children of Alzheimer’s patients mean when they talk about looking at a loved one who’s no longer there?

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