Don't forget the 'Dawn effect'. Cortisol levels increase just before you wake up in the morning. This is a natural action of the body's endoctrine system - taking your blood glucose levels immediately on rising will give an elevated reading, which may not be an accurate reflection of your normal...
I've tried posting on here, but get a silly artificial intelligence type message to say that the content is probably "too spam-like".
It then tells me to contact an administrator - I can't find one. Can an admin help me out? I'll gladly send you the post for you to moderate before it's published.