Your brain needs to rest even when you are awake. Acquire new memories while using your brain intensively with a sense of purpose. (New memory = neuron generation) In order to promote memory, it is important to make the decentralized brain work in a way that does not require the brain to work too much, and to give the concentrated brain a rest. This allows the distributed brain to organize its memories. The brain is an organ that consumes a large amount of energy. In order for the brain to work, it is necessary to have a good balance of fat, protein, and carbohydrates. To understand peace of mind, we need to understand how the human brain works.