In layman's term, Zen meditation is letting go of pessimistic thoughts and simply relaxing. In Buddhism, it is a contemplative discipline performed to achieve calmness in the mind and body. Most importantly, it aims for a practitioner to understand the nature of life to obtain enlightenment. To fully experience positive results of Zen meditation, there are three general methods to consider such as Concentration; Koan Introspection; and Shikantaza.
Devavani means "divine voice," the energy of existence which moves through the meditator, who becomes an empty channel of expression. If done in the evening, it deeply relaxes the mind and creates a profound sleep and inner peace.Devavani meditation lasts for one hour. There are four stages of 15 minutes each. Keep your eyes closed throughout.