Lori, be sure not to have a lot of carbs or sugar with breakfast or lunch. That raises your blood sugar and will make you sleepy. You do need some for energy but not much. Low carb soup, salads, fruit, leftover meat from dinner, etc. are good choices.
During lunch break, try to walk around a bit and even get up and walk periodically throughout the day if your job allows. Have a copy of the stretching exercises because these can be done sitting down and no one will realize what you are doing and that gets the blood flowing, too.
Lastly, I have a cup of hot tea...maybe two...and the caffeine in that helps wake me up. It's not strong caffeine like coffee. I can't drink coffee because of all the caffeine. I don't have it after 5 PM or it will keep me from falling asleep at night. Hope this helps.
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