Every once in a while, the onset of Elizabeth's "sleep window" appears out of nowhere. One minute it seems she is happily and busily rolling around, grabbing and chewing on everything in sight, playing with her feet, etc.
And the next minute she is DUNZO...she begins to whine and then gets this look on her face that seems to say, "WHY am I still here with you people instead of napping snuggly in my crib?!?! WHY?!?!" It is, of course, the saddest look ever...so we do our best to watch for the early signs of fatigue before we get to the whining, yawning, eye-rubbing, most-pathetic-look-ever stage!