when the delta wave of .4-4 Hz is the dominant brain wave, it is in a deep sleep and unconscious state. The quality of people's sleep is directly related to δ wave. Δ sleep is a dreamless and deep sleep state. Usually, the normal sleep cycle will appear four or five times a night, and the first period that occurs in the early stage of sleep is a dreamless Δ wave (Non-REM) state. Therefore, if you are in trouble sleeping, you can summon your physical and mental feelings that are similar to the edge state of Δ wave (of course, you have to be trained), you can quickly get rid of insomnia and enter a deep sleep. What you really want is this short time. In addition, according to scientific research, δ wave is also the key to develop human intuitive system.

when the theta wave is the dominant brainwave of 4-8 Hz, people's consciousness is interrupted and their bodies are deeply relaxed, which is a high-level mental state, that is, we often hear "into a steady state". In this state, because of the interruption of consciousness, the critical or moral filtering mechanism that we usually have when we are awake is buried, which opens the door to the mind and presents a high degree of Hyper-suggestibility to the external information, which is why people will easily receive external instructions when they are hypnotized. In addition, Theta wave has a very direct relationship with the limbic system of the brain, which is very helpful for triggering deep memory and strengthening long-term memory (LTP). Therefore, theta wave is called "─The Gateway to Learning and Memory" in the scientific community.

The slow alpha wave is 8-9 Hz, and the mind is in a daze before going to bed. Consciousness gradually blurred.

The state in which the inspiration, intuition or idea in the middle alpha wave is 9-12 Hz exerts its power, and the body and mind are relaxed and focused.

fast alpha wave at 12-14 Hz is in a state of high alertness and no time for him to take care of it.