Not unexpectedly, yesterday's hyperfocus became today's over-tiredness.
ADHD and sleep are a bit like water and oil: they don't mix very well. For instance:
"Dozing off here and there into a shattered sleep, Emma tried going over her mind with an imaginary broom, cleaning the clutter out. The broom hit a sheep and evaporated. Sheep! One, counted Emma, but it was gone and none
other came."
All that's left is to dream of sleeping... or read.