- Áú¹®³»¿ë - I love this site level 20 If there is some evolutionary reason why contagious yawning would be shared among primates, brain temperature could offer a clue. Studies suggest that yawning helps regulate brain temperature, including the mild site-specific increases associated with sleepiness. Patients with brain disorders associated with poor temperature regulation also display atypical yawning patterns, studies have shown.
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