I really ought to have gone to sleep last night.
When I’m tired, I can’t handle context changes. I should be doing some reviews, but switching from books to web research to writing is just impossible for now. Focus, however, isn’t a problem. This morning I built a fairly complex relational database pretty easily. Now that I’ve got my nose out of the problem, however, it would be pretty difficult to explain how it actually works (especially the subquery system for it) or what it does, exactly.
I really ought to have gone to sleep last night.
I should order some books; that I could probably handle.