I went for a girls' day out with my sister/SILs/friends yesterday and drank most of a small cup of Pepsi with lunch (probably 8-12 oz), after not drinking any soda in a very long time.
YIKES.
On the rare occasions when I go against my better judgment and have an extra cup of coffee or two later in the day, it keeps me up late, usually reading or writing.
That Pepsi made me feel like I was flirting with a panic attack for a couple hours after drinking it. Had to close my eyes and focus on regulating my breathing for a bit to keep my head straight so I could keep up with the rest of the ladies' conversation.