As for sleep, I consider sleep very important. So, my car-bag has a "sleep kit:" mask, inflatable neck pillow, earplugs.
I am putting together a small BOB for my child, so that it has what he needs individually. That way, he could bugout with me, or my wife, or someone else, whatever it took. He is 4 years old, so that has some special considerations.
I'm putting together a necklace with contact info sealed up somehow, a whistle, and an LED flashlight. His bag would have a plush toy he likes and some other toys, some of his favorite snack-foods, etc. Not too sure on details. I don't want to over-do it as I want him to be able to carry it himself, but I want it to cover essentials.
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When times are hard we must harden to them.