Go to bed at the same time every night. There is no way to have late night week-ends suddenly on Monday morning wake up refreshed. If you do enjoy later nights on Friday and Saturday vow to get to bed early on Sunday to wake up rested.
Avoid the sugar and caffeine roller coaster. Eat some protein and
foods with a bit of fat in the morning. The brain needs protein and
the body does not store it. You don't have to eat very much- a glass of low fat milk, a piece of cheese, or a handful of nuts will get you going instead of pure carbohydrates like a plain bagel.
Take a 5-10 minute power nap around lunch. Even if you just close your eyes and let your mind drift you will be refreshed for the afternoon. This is also effective anytime you feel yourself not concentrating, reading the same material over and over. Give in to the urge and completely relax for a few moments.
Drink more water and liquids. I know, everyone says to drink more fluids. But most Americans are in a constant state of dehydration from filling up on coffee, tea, and sodas with caffeine. This is very stressful to the kidneys and can cause irritation to the bladder. Keep a sports bottle filled with your favorite flavored water or just plain and keep it with you at all times. Set a goal- empty by lunch, refill, empty again by the time work is over. Carry plenty of water in the car too for you and your family.