This is an intriguing hypothesis, but are you aware that Eliezer also has this condition? I was under the impression that he was working off of his own experiences here and nothing more.

I probably heard that at some point; it's been years since this started, now. But I expect better of him than "I get ingrown toenails and ingrown toenails don't get enough attention from the public so I'm going to give my protagonist that problem, too."

Also, cannon Harry didn't have the sleep cycle problem. For the most part, there are in-universe reasons for departures from cannon other than, "That was dumb and I'm not writing a story with dumb in it."