The procedure is simple and with practice you can learn to control your brain waves without the help of neurofeedback. Brain waves reflect what you are doing from moment to moment. When one part is active and producing fast brain waves, other parts take a rest and produce slow waves. The difference between ADD brain waves and non-ADD brain waves is their pattern. ADD sufferers usually produce more slow waves than non-ADD sufferers.
Delta waves are the slowest brain waves.
We experience these during sleep. Beta3 brain waves are for our highest level of concentration. Most people do not have a problem reaching Beta level, but if you have ADD you may feel trapped in the Theta or Alpha level, which by the way would explain your tendency to daydream or fall asleep in class. By using the computer monitor to watch your brain wave activity you can train yourself to stay out of the Theta and Alpha levels. Not everyone with ADD or ADHD is a candidate for neurofeedback training.