One of the main reasons we get tired between the hours of two and four pm(most do) is lunch.
If you are eating a sandwich and having a soda, or maybe some pasta and a coke-you'll find yourself feeling sleepy about 2 hours later. The reason is the carbo loading is wearing off.
In addition to the sound advice of making a regular sleep schedule, switch your carbo-heavy meals to more veggie-based or meat based; salads, for example and no soda or breads. Try fruits for breakfast or eggs.
Get fresh air during lunch; take outdoor breaks whenever possible.
Some countries have a tradition of midday breaks(siestas, etc) because of that slump. It's certainly not unusual, but can be lessened.
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