And the difference between a functional and non-functional human being.

Grow up. People are different than you. You don't know their life and you obviously haven't experienced enough of the world to recognize how difficult it can be for some mothers to get enough sleep to function. Especially if she is recovering from a difficult pregnancy and/or delivery. Add to that the high incidence of post-partum depression and losing sleep can be all the more damaging.

As our very pro-breastfeeding lactation consultant wisely told us with our first child, "Breastfeeding is best, but your child will benefit so much more from a mentally well and rested mother."