Whether Harry will let himself recognize those conclusions is, as you said, doubtful.
Harry thinks he's still young enough to weather the bad effects (rather like the people who think they can drink endlessly as long as they're in their twenties and never have bad effects). And if he doesn't sleep he has more time to study and improve at his progress towards being a full Healer. He never has learned to take pleasure in them for their own sake, so he regards food and sleep as necessary but irritating diversions.
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Whether Harry will let himself recognize those conclusions is, as you said, doubtful.
Harry thinks he's still young enough to weather the bad effects (rather like the people who think they can drink endlessly as long as they're in their twenties and never have bad effects). And if he doesn't sleep he has more time to study and improve at his progress towards being a full Healer. He never has learned to take pleasure in them for their own sake, so he regards food and sleep as necessary but irritating diversions.