Biopsychology: Cats Prefer to Sleep on Their Left Side

Biopsychology: Cats Prefer to Sleep on Their Left Side

For animals, sleeping on their left side is not about comfort. It is a survival strategy.

Cats prefer to sleep on their left side. This is the conclusion drawn by an international research team that analyzed several hundred YouTube videos of sleeping cats. The researchers see this bias as an evolutionary advantage because it favors hunting and escape behavior after waking up.

[…]The research team around Dr. Sevim Isparta from the Animal Physiology and Behaviour Research Unit in Bari and Professor Onur Güntürkün from the Bochum working group Biopsychology wanted to find out whether cats prefer to sleep on one side or the other. “Asymmetries in behavior can have advantages because both hemispheres of the brain specialize in different tasks,” says Onur Güntürkün.

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Willemsen, P., Newen, A., Prochownik, K., & Kaspar, K. (2025). With great(er) power comes great(er) responsibility: an intercultural investigation of the effect of social roles on moral responsibility attribution. Philosophical Psychology, 38(2), 820–846. https://doi.org/10.1080/09515089.2023.2213277

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