It never occurred to me people might game their results but that makes perfect sense.HbA1c is done over at least 3 months so you can't kid the Clinicians like you can a normal p rick test (come on Mods )
With the normal p rick test you can know the part of the day when you are likely to be within range and just give them those results or just make them up.
Doing it for my own curiosity and benefit I can pick the most appropriate times for reliable results.
I've noticed in the past my blood sugar level is higher when getting up than later in the morning (assuming I'm still in a fasted state).One can test using a blood glucose monitor when fasted first thing in the morning to monitor blood glucose homeostasis.
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Cortisol peaks in the morning and can result in liver glycogen stores being converted back into glucose resulting in elevated morning blood glucose.