I have decided to make today more worthwhile.
I was completely shattered yesterday, but still managed to drag myself to training (sports-related), and my coach won't let me slack. I'm glad of it though because I managed to get a PB :-).
So I've figured, if I can get a PB when I'm completely knackered, I can force myself to get more work done as well. I'm feeling motivated today... I will finish that chapter!