Sleep is apparently irrelevant.
I discovered, mid-way through the day, that I’d put my underwear on backwards.
Later, when I was picking up the kids, I left the door of the car open by accident. (I heard it chiming, but thought I was imagining it.) When I came back to load the kids in, about twenty minutes, one meltdown and a time out later, I tried to start the car and joked that I hoped I hadn’t run down the battery.
It didn’t start.
I tried again.
Then I put it in park and tried to turn it on again. Like magic. Luckily my dignity has long since disappeared, so the evidence of my lacking wits was not as embarrassing as it could have been.
(And I’d like to say in my defense that I learned to drive in a stick shift car and you don’t have to be in park to turn them on.)