first thing in the morning is unreliable due to the fact our liver produce glucose to enable us to get out of bed and start the day, its called dawn phenomenom and very unhelpful to diabetics, our livers dont know we have DB so carries on as usual, what we eat during the day is what gives us our blood glucose so monitoring what we eat is all that really matters for a type 2, if you tested late night 5 hours after eating it wouldnt tell you anything other than a baseline, theres little to learn from it