I changed into my pajamas as soon as I got to the house, and climbed straight back into bed. I slept until 2:30 in the afternoon, read in bed until about 4:30. I was feeling rather more alert and capable of movement by that time. I did eat dinner, and haven't had reason to regret it, so I think that's a good sign. Hopefully it was a one-day phenomenon, and all will be cured tomorrow.
It'll be back to bed for me pretty soon, I think. If nothing else, I'll be rested tomorrow.