Meditation covers a wide range of practice from relaxation to the spiritual. Ultimately, meditation is a combination of focus and relaxation )which may sound like an oxymoron but as you become more proficient it will become clear how these two can go hand in hand).
In alpha you are stil in control of your mind. At the alpha level, the brain waves slow to around 8-12 pulsations per second (about half the normal frequency). It is a comfortable, relaxed yet aware state that heals and refreshes the body. Instead of falling into the alpha state just by falling asleep, you can learn to induce this state and reap the benefits from this resource within yourself. In this state, you are open but not vulnerable, powerful without being constrained; deliberation and visualization become tools where you sharpen your mind and your will.