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“ Things may have been different if Stonewall Jackson had been there. Lee relied on him quite a bit.”

Perhaps. Jackson has been mythologized. People forget his failures. He disappeared during the battle of 7 days and he was the only southern General whose lines were completely breached at Fredericksburg. Not saying he wasn’t a good General, he was. But he had his failures.

[Verginius Rufus]

I read something to the effect that Stonewall Jackson's poor performance during the Seven Days' Battle was because of severe lack of sleep.

Lee thought he would have won at Gettysburg if Jackson had been there. Of course there's no way to know.