Spiders Can Rack Up REM-Like Sleep Debt (And May Even Dream), Just Like Humans

Researchers at the University of Bonn observed the jumping spider Portia fimbriata exhibiting REM-like sleep, with limb twitches and eye movements, indicating spiders can experience REM sleep debt. The findings were reported in a 2026 study, extending evidence of REM-like stages to arachnids.

Source: Spiders Can Rack Up REM-Like Sleep Debt (And May Even Dream), Just Like Humans — ScienceAlert

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