Withdrawals

I have really curbed my soda intake over the past week or so. Typically, I would have about two Diet Cherry Dr. Peppers a day. I know it isn't the best thing I should be drinking so I am trying to find other things to have instead. I am not giving up caffeine; no, that would be terrible. I am still having lattes and iced tea occasionally but in the past week and a half I have maybe had one soda. Cutting back but not cutting it out all together. Anyway, the past three days, I feel like I have hit a brick wall at around 2 pm. My eyes get heavy and I'm blinking trying to keep them open but it's been almost impossible. I did fall asleep the other day and when I woke up, I seriously felt like I had been drugged. I could barely move and get to class. I am hoping this side effect ends soon or I might have to start drinking (soda) again.