Why am I Low at night / high in morning?

Over the last 1-2 months I have noticed on multiple occasions having normal BS and waking up moderate to significantly higher. For example, last night I was sub 70 before bed, woke up this morning 185. On average I get 7 hours of sleep nightly. If I wake up with less hours or more hours has not presented a change to my fasting reading.

It really bothers me to start my day not in a healthy normal zone. Read some chatter about adrenal fatigue or possibly thyroid dysfunction. Bringing my question to you guys for any direction on why and how to address this. Thanks guys/gals.