 His smile will gain in radiance, and he will answer my blink with one blink of his own. This will go on for some time, whipping Mike up into a fit of laughter. But tonight, I lie next to Mike. It's 11, well past his bedtime. He's been laughing hysterically for at least an hour, which might seem cute to you, but to me, indicates that he's on the edge of a seizure.