Introduction

This issue explores the inter-individual, social and collective aspects of dreams. From specific files supported by case studies, surveys and examples, it describes and analyzes a flow of narratives, images, collections, beliefs and discourses with scientific aims. How are dreams exchanged? Though they are very often open to interpretation, they can allow us to communicate with the dead or the living, and also convert, reassure, heal, frighten, stupefy, transmit and bring alive a prediction, a testimony, a legacy, a pleasure or a promise, confirm a theory, or even... cause us to dream, and elicit other, answering or shared dreams.