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by Pica_soO 3454 days ago
Could there be some guarding reflex, that detects irregular sound or the absence of regular sounds and jump starts the sleeping mammal if predator presence is detected?

https://dash.harvard.edu/bitstream/handle/1/5342191/Acerbi%2...

http://the.sleep.ru/lib/NeurosciBiobehavRev_2008_dolphins.pd...