So after it all, I guess I can understand how after biking 25 miles hard with a crash in the middle, stopping for a few hours to hang out and eat Real Food, getting back on the road for another pretty hard 25 to get home (including a stop in Devon for some random small groceries), and then eating lots of carbs'n'protein and drinking lots of water, my body might decide that it wants sleep now and won't take no for an answer. It had a lot of stuff to take care of without consciousness throwing it any more crap... digestion, healing of wounds, replenishing muscles (they've worked a lot the last 3 days).
The intense sleep rush still felt pretty crazy, though. Now that's over and I'll probably be up for a really long time. Grr.
Out-of-use train tracks are always a hazard when you're on a road bike. You try to hit them at as steep an angle as possible. I was setting up to do this, but there was a pothole along the tracks, and I noticed it too late to avoid it. When my front wheel hit the pothole it turned itself slightly to the right (the direction of the tracks) and my wheel got caught in the groove next to the rail. At this point my wheel was pointed in a very different direction from my momentum. There was not much to do besides try not to injure myself on the fall.
The cuts I wound up with were not nearly as bad-ass as the ones I got falling on that rock face in Big Sur. Which is nice. Handlebars are bent up a bit. I think I've had pretty good luck with crashes.