Why does blood sugar spike in the morning? As every diabetic knows, diet and exercise are critical in controlling unruly blood sugar levels (BSL), And as many have experienced, a proper regimen usually leads to drops in BSL.  But, often, while postprandial readings often come down to less than 140, morning blood sugar remains stubbornly high. Doctors call this the ‘dawn phenomenon, ... https://www.freedomfromdiabetes.org/blog/post/why-your-morning-fasting-sugar-level-is-high/1509