For the women who have decided to give nursing a go, good for you. But, be prepared because it can wear you out. Luckily, you will probably get used to it very quickly.
In the "How to Be a Mother" manuals that I read, it said that when nursing, a woman's body releases the hormones oxytocin and prolactin, which then allows the milk to start flowing freely for baby. To see what effect this has on mommy, read more.
The hormones are also responsible for making the new mommy drowsy. I don't know if it is was sleep deprivation or the prolactin, but on more than one occasion, I woke up in the glider with my nursing daughter in my arms – both of us having been fast asleep.
I can't say that the cat naps weren't welcome as I needed to catch up on some z's, but it would have been nice to know that breastfeeding would induce heavy eye lids.