I used to have a rule, for getting things done on a daily basis: the new day doesn't start until I wake up, or the sun comes up -- whichever came first. So if it's 3 a.m. and still dark and I haven't been to bed yet, as far as I'm concerned it's still yesterday. I used to do a lot of writing at 3 a.m. so that I could go the hell to sleep.
That rule has never applied to the blogs, which keep track of what day things were posted on and so will let me know if I don't get it done before midnight. (I can back-date posts, but that's totally cheating, obv.)
Today was a very busy day, and while there were definitely a few windows where I could have blogged, there was no point where there was actually an appropriate time for it. I've taken plenty of personal days in the past several months for my own wellbeing and stress level (once every two months, in fact), but I haven't actually worked out the way to prioritize when what's filling my time is the presence of people I care about.
I'm still not sure I need a specific rule to handle that; it's pretty rare that literally every waking moment of my day is filled by either class content or other people, and today was a really great day because of that fact.
But it's something I think I'll keep an eye out for, in case it comes up more often than I'd realized or anticipated.