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Eat breakfast. Stretch. Refuse naps during the day.
If your blood sugar is low, your energy is low too. By eating a hearty meal in the morning, you are "breaking fast" and giving your body an energy boost in the morning. Try to eat healthy, nutrient-dense foods to promote stable energy levels. Sugary cereals and pastries may sound appealing, but they can cause a crash after the initial surge of energy. Get your body moving in the morning, however you can. If you have time to exercise in the morning, that's great. If you don't have time for a full workout, some gentle stretching can do the trick. By moving around and stretching out your body, you get your heart pumping and blood flowing to your brain. You may also get a burst of endorphins, the "feel good" chemicals that are released during physical exercise. It is normal to feel sleepy and lethargic while your body gradually gets used to your new schedule. However no matter how groggy you feel, don't let yourself nap. Sleeping during the day will make it harder for you to fall asleep at night, and you'll undo the hard work you did by waking up early.