Had to read this 4 times before I understood it ....
My defence is; working late last night, eating later still, (hence my grammatical faux pas on the original comment), followed by a slow morning. (In the 'mental agility' sense. )
I've remedied my grammatical error, with a different word (care of a Thesaurus) that is more appropriate on about 3 levels I can think of, despite my suffering from a dose of the 'morning after the night before', without the dubious benefit of the 'night before'.