The other thing to remember about circadian rhythms (other than the very poor jokes, thanks guys!) is that they are not fixed for life. After years of having steady daily carb ratios, I developed a greater need in the morning (for no apparent reason – didnt coincide with anything else happening).
As for the carb counting, eggs. Not sucking, but the size of. 1 egg sized potato or lump of mash = 10g CHO. 1 egg sized lump of baked beans = 5g CHO. etc etc etc Work out how much your favourite foods count per size that suits you, then you’ll have a good starting point for guesstimating how much a meal counts.