As a parent, you have to think of yourself as a tube of toothpaste.
You get emptied, and you think, "That's it." But there's more to do and no replacement for you so you slide the tube along the side of the sink to squeeze the last drops from the bottom.
Then tomorrow, when it's REALLY empty, you have even more to do and you roll up the tube and crush the cap area to get another bit out of yourself, and you squeeze that out.
THAT'S parenting.