HbA1c and Fasting Blood Glucose levels are related, but not the same thing. The HbA1c is a mean average reading of your Blood/Glucose level over the previous 3 month period, where as the Fasting Blood glucose level is what your body settles back to after an overnight fasting period.
Also it might be worth while researching both the 'Morning Phenomina or Dawn Phenomina' a common effect that raises Blood Glucose levels first thing upon waking. A much rarer thing is also the 'Symogi' effect that in many ways appears to give the same effect but is actually caused by a different body action.