I was half-awake when I heard my sister video-calling, so stumbled through to answer it, only to get a:
"David, are you just waking up! It's 2PM!"
(plus raucous laughter from her husband).
It was only after I'd answered her question and she'd rung off, that I started wondering "If I'm only just waking up, why are my breakfast things on the table?"
I eventually figured it out, but it's a measure of how tired I was that it took me about half an hour to put it together.
I didn't get to sleep at all last night, because I had that occasional opioid painkiller itching all over side-effect.
So about 8AM I gave up on any hope of sleeping, pottered about for a couple of hours, then ran a bath, had my breakfast while that was filling, got out of it just gone 11AM, and promptly fell asleep while getting dried while sitting on my bed.
And I had absolutely no recall of any of this when I woke up at 2PM. If it wasn't for the breakfast things I might still be oblivious to the fact I'd only managed 3 hours of sleep, and spent the entire night awake.