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University of Bonn spider sleep research

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2026-10-30 18:43 UTC → 2026-10-31 03:30 UTC · added ~~removed~~

Researchers at the University of Bonn have identified regulated sleep cycles in the Australian jumping spider, Portia fimbriata. Published in the journal PNAS, the study provides experimental evidence of distinct sleep architectures, including a phase resembling Rapid Eye Movement (REM) sleep characterized by involuntary eye movements and muscle spasms in the legs and silk-producing organs. To distinguish sleep from simple inactivity, researchers used acoustic stimuli, noting that spiders showed significantly delayed reactions to loud noises during active sleep episodes. Observations made via infrared cameras revealed two primary stages: a quiescent phase where the spider remains nearly motionless, and a phase characterized by involuntary movements. Further findings indicate that these spiders exhibit sleep compensation, allowing them to catch up on lost sleep after periods of disturbance. The study provides some of the most complete experimental evidence to date that spiders engage in true sleep rather than mere rest. Recent reports emphasize that this sleep architecture mirrors key features of vertebrate sleep more closely than previously expected.

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