SO apparently if you add enough instant coffee to make it taste like a "strong" cup of coffee... its gonna contain way more caffiene than you expected. Didn't realize it until my hands wouldn't stop jittering.
It actually tastes pretty good but yeah. Don't be like me. Looks like I'm definitely staying up until midnight.
I'm a decaf fan as well. I'm pretty sensitive to caffeine even though I usually have 3-4 cups of normal coffee a day. I'll switch to decaf if I get jittery at all. I had 2 cups of the strong instant stuff and was immediately uncomfortably wired. I still kinda feel it to be honest.