I used to feel groggy a lot too. I started making myself a fresh fruit + flaxseed + pomegranate juice smoothie everyday, and my energy levels have been way up - I think nutrition and hydration makes a real difference (my diet traditionally had consisted of rice and meat with no veggies). Exercise also does wonders.
It also helps to work with your natural circadian clock, if I wake up after 8-8:30, I usually feel groggy and less awake throughout the day.