Tiredness just interfered with one of my rules: don't take anything too seriously. Which I just did, in an online discussion, when I took some banter way too seriously.
And now I feel horrible, and stupid, and like I haven't learnt anything from life at all.
I'm great at giving out advice to people, but totally shit at following that advice myself.
...And I was about to post this on Facebook, but then I realised that despite having 100+ "friends," none of them would probably read it.
And if they did, they'd want to know what it was that I did, and I'd have to explain it all, - and I realised how silly it would all sound and that they'd probably not even realise why I feel so stupid about it all.