Humans sleep in two modes: rapid eye movement sleep (REM) and non-rapid eye movement sleep (NREM). During REM sleep, the eyeballs move rapidly while the body muscles relax, and the brain’s neurons are active in the same way as during waking, and dreams usually occur during this phase. REM sleep is common in vertebrates. According to a paper published in the journal PNAS, researchers report that jumping spiders have REM-like sleep . Spider eyes contain structures called retinal ducts, which are not apparent in adult spiders, but newborn spiderlings are translucent and can track the movement of the retinal ducts. The researchers turned off the lab lights and tracked it with an infrared camera. They observed periodic REM movements.
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