Diet coke wakes me up in the morning

I don't care for coffee and most of the time it is too hot to drink hot drinks so I get my "wake-up jolt" from diet coke. By the time I get to work, if it is fall or our version of winter I will have a cup of tea. I also need time to just wake up, so I usually watch the news for a little while before I actually get moving. I have my routine that I do when I'm half asleep: let the dogs out, feed and water the dogs, take my medicine, pour a LARGE diet coke, and flip on the tv to see what the weather is doing today. Only after all that, I'm able to actually wake up and function.