It's my theory that in every set of parents there is one naturally gifted with the ability to sleep through an attack of armed bandits, and one who awakens every time the children roll over in their sleep. It is not always the father who is the former and the mother who is the latter, but in our case, it is. That is why I scoff when I hear suggestions about fathers helping out in the night. (Ha, ha!)
It is a far, far easier task to take D1 to the potty and answer whatever questions have been troubling her in the night ("Does Papa have a night-night blanket?"), provide D2 with his requisite 20 ounces of water, repeat all bedtime routines and convince them both to go back to sleep than it is to awaken DOB. I think he would wake up if I told him armed bandits were attacking, but only long enough to run them all through. Then he would promptly fall back to sleep. Whereas if I hear a rustle coming from D2's bed I awaken and lie there, heart pounding, for half an hour, wondering if he is about to wake up.
Now, there is good cause for this, of course. If all parents were sound sleepers, the children would die of anguish in the night. If all parents were light sleepers, the parents would die of anguish after about three days with no one getting any sleep at all. But it is hard to be philosophical about the balance of nature when one returns from the third trip of the night to see a contented log undisturbed in the bed.
However, things are looking up. A bit. D2, upon weaning, often sleeps all the way through the night, at long last. And last night we tried the experiment of leaving his water in bed with him, whereupon we discovered that he can find it and drink from it unassisted when he wakes up in the middle of the night.