OMG! Do NOT take a nap! If you feel nauseous get to the ER!
No nausea, and my head is a lot clearer now than it was even 30 minutes ago. But when it happened, it definitely stunned me briefly, and I sort of bounced off, stumbled, and fell to the side. I was able to get back up (and stay up) in under 5 seconds, says daughter-san (who was pretty horrified when I went down!) My right cheekbone is slightly swollen, less than I’d expect. My glasses absorbed some of the impact? :-)
I’ve had worse face-plants, but not for quite a few years!
Thanks, BTW!