Useful. According to Baidu Encyclopedia, alpha brainwave is one of the four basic brainwaves, and its average oscillation frequency is 10 times per second. It is inherent in the human brain and one of the basic states of the brain. Alpha brain waves can make people's emotions stable and happy, and their attention is more concentrated, which is not easy to be disturbed by the outside world. By using alpha brain waves, it can help improve sleep quality and prevent insomnia and sleep quality decline. Moreover, alpha brain waves can make the human body in a state of deep relaxation, promote the generation of alpha brain waves, make people quickly enter a state of sleep, and effectively improve the quality of sleep. Long-term use of alpha brain waves can also improve personal concentration and memory to a certain extent, so alpha brain waves are really useful.