Many people start getting fatigued in the afternoon a few hours after noon-time meal. There are still a few hours of work still left in the day and you're already tired looking to just go home and do something else. You will discover things which can be done that will assist with the afternoon slump which you might be experiencing daily.
Exercise more in your routine. Exercise, while it takes energy, assists you have a little more strength the whole day. This is very important mainly because it can benefit in those afternoons hours to feel much more energized willing to complete the work day for all those last couple of hours.
Get proper nap at night. When you're on limited nap, it's easy to wake up the next day, remain busy, and become alert. Once the mid-day comes, you begin to literally get tired as a result of lack of sleep during the night.
Own an energetic lunch break if you possibly could. Go walking around and do a couple of things that you like doing. This will help you relax without feeling so tired when the afternoon comes.
Eat a wholesome food during the afternoon that will help you from feeling fatigued. This should be something healthy without having too much sugar so you aren't going to again crash an hour or so after you consume that.
Whilst it may appear unclear, try to discontinue caffeine. This will cause problems with the body always going up and down throughout the day. Without one, you'll really feel more stable the entire day.
Go on to any physical work or job that you delight in more for this part of the day. Then you can feel a bit more energetic and alert doing some of the tasks which you love versus the most tiring ones just wishing the time moves faster so that you can go back home.