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New research chronicles spiders in states of what seem like dreaming. Jumping spiders discovered sleeping suspended on a silk line experience muscle twitches and eye movements similar to the REM sleep phase associated with dreaming in humans. Scientists revealed the eye movements by recording the sleep of baby spiders with translucent exoskeletons, revealing movement of the tubes that control the position of their retinas inside their heads. Video Credit: Daniela C. Rößler
