The study is believed to be the first time REM sleep-like behavior has been documented in a terrestrial invertebrate. The researchers also documented limb movements characteristic of dreaming, including leg twitching and curling. The team of former Harvard researchers analyzed videos of the sleeping arachnids and found they exhibited a rapid-eye movement (REM) dream-like state, which they could directly observe because juvenile spiders have translucent exoskeletons. Do spiders dream? A new study looking at infrared footage of 34 juvenile jumping spiders suggests that perhaps they do.
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