Exploring Animal Dreams: A Comparative Analysis of Sleep Behaviors and Neural Mechanisms Across Species

Animals likely experience dreams, though the content and nature of those dreams remain uncertain. This review evaluates evidence from neural activity monitoring, memory replay, and dream-like behaviors, focusing on sleep patterns such as REM, slow-wave, and unihemispheric sleep that are linked to dreaming. It proposes studying octopuses as a novel way to decipher animal dream content and also examines atypical sleep patterns and deviations from ordinary dreaming.

Study at a glance

Abstract

Often deemed a 'black box' resistant to scientific examination, the human mind challenges empirical inquiryparticularly in subjective experiences like dreams.However, objective empirical measures can indeed be applied to such phenomena.While there has been notable progress in understanding human dreams, the domain of sleep and dreams in non-human animals remains less explored.This review paper addresses whether animals experience dreams and, if so, the nature of these dreams.To this end, it evaluates various research methodologies, including monitoring neural activity, replaying new memories, and analyzing dream-like behaviors.It also identifies crucial sleep patterns, such as Rapid Eye Movement (REM), Slow-wave (SW) sleep, and unihemispheric sleep, that play significant roles in dreaming.Furthermore, this study proposes a novel approach for deciphering animal dream content, specifically by investigating dreaming in octopuses.The paper concludes by examining atypical sleep patterns and deviations from everyday dream experiences.