Don't know how long you were in "lala land," but after I had a knee reconstructed several years ago, I went back to the doctor a few days later and told him I was sure I'd suffered some sort of brain trauma during the surgery because I couldn't concentrate on anything I was reading and couldn't work crossword puzzles like I did prior to the surgery. He told me that for every hour I was under the anesthetic, it would take a month to get my brains back. I was out for nearly 4 hours, which sort of explained some of the problems with concentration I was having. (It didn't take 4 months to recover, thank goodness . . . at least I don't think it did.
)
I'm sure you felt just fine and well enough to take over driver duties 5 hours after your exam, but maybe your brain was still enjoying some of that good sleep! Too bad your fellow campers didn't bother to tell you about that sign. That would have been the neighborly thing to do.
Carolyn