Sleep to sleep
It’s amazing that babies (and kids) have trouble falling asleep if they don’t nap well. Even adults have trouble if we’re running short on sleep. But it seems to make more sense in our case since we’re often keeping ourselves awake with thoughts like, “If I fall asleep right now, I’ll get 7 hours which is just enough sleep to…” What are babies thinking to themselves? “If I could only fall asleep now I’ll be able to nap better tomorrow…”?
It doesn’t matter now. She’s asleep. Two walks totaling 1.5 hours later, anyway.
I really need an iPod. Send your donations… 
Update: All that walking and she still woke up 10 minutes after I put her down. She was so deeply asleep that I was able to get her out of the sling without so much as a grunt, too. She fell asleep after another feed and was up for the morning a mere 8 hours later. Speaking of running short on sleep…