Haha, hopefully it was a tad more interesting than biology class!!
Yeah the sugar could definitely cause a crash in mood and energy if you consume it in the morning. Have you noticed any fatigue after drinking a coke? Keep in mind though that if you're extremely physically active during the day, that coke could actually give you more energy (provided that you're burning a lot of calories and expending energy).
I'm glad to hear it, thanks for reading and leaving your thoughts my friend!