We figured it out
So, we got back from New Zealand on Friday at midnight; I didn't sleep at all on the flight from Wellington to Los Angeles, so I've been absolutely beat. I got a cold, too, which always happens to me when I fly - next time I fly any real distance, I'll be the guy with the surgical mask.
Heather has figured out why we're sleeping so much: while in New Zealand, we saw literally hundreds of thousands of sheep. According to Heather, we've been sleeping off all the counting sheep we'd done in "enzed".
Some of the hundreds of pictures we took are here. More to come.
Jet lag sucks.