Onírica it means ‘reference to dreams’ –taken in the sense of ‘dreaming’, not in the sense of ‘sleeping’– and it is a cultism from the Greek oneiros ‘dream’, incorporated into Castilian in the first half of the 20th century. At that time, there was a period of boom in Freudian psychoanalysis, a discipline that introduced the interpretation of dreams as a tool for the study of the human mind. For that reason, oneiric first entered the Dictionary of the Academy only in 1930.
The dream immerses us in a virtual reality made up of images, sounds, thoughts and / or sensations. The memories you may have when you wake up can be simple (an image, a sound, an idea, etc.) or very elaborate. The most elaborate dreams contain scenes, characters, situations, and objects. It has been proven that you can have dreams in any of the phases of human sleep.