The release from stress that a dominant alpha brainwave state brings will also stimulate and enhance the immune system. Some people rarely experience alpha brainwaves. These are probably the people you know that are stressed out all the time. Using alpha brainwave entrainment recordings help to relax you and to train your brain to relax when you want it to. It is also a commonly held idea that
No side effects have been reported from brain entrainment use.  Most producers of the technology warn against the use of brain entrainment by children under age 18, people with seizure disorders, and pregnant women.  Studies have not been conducted on these populations to date.  Additionally, (and this goes without saying) it is suggested that you do not drive while listening to brain entrainment due to the relaxing effect.
With regard to that, I would like to tell you a story about GMO. I recently explored a case study about GMO products, which explained how initial research showed no negative effects were caused by GMO products. A group of French scientists, however, decided to gather a research group and examine more closely  its effects by prolonging the study for up to four years. What they discovered was that although no initial side effects were seen in the tested animals, after the third year of the study, the ones that were fed with genetically-modified foods started developing tumors that affected more than 1/3 of their bodies.
Meditation enhancement: There are several companies that sell brainwave entrainment sessions specifically designed to enhance meditation. The sounds provide a stimuli to focus on during the meditation, and the brain waves naturally shift towards the frequency provided. Whether meditation is actually enhanced by brainwave entrainment is a subject of debate. However, advanced meditators commonly experience brainwave synchronization – which the right and left hemispheres display the same frequency brain waves.  While there are scientific benefits of meditation, it is unclear as to whether they are enhanced, hindered, or unaffected by adjunctive brainwave entrainment.
If brainwave entrainment leaves you with unwanted side-effects (see below) or discomfort, you’re probably encouraging a range of brainwaves that are already excessive in some area of your brain. The way around this is to get a brain map to see what your brain’s strengths and weaknesses are, and see what (if any) brainwaves could use some encouragement. 
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