Autumn's impact on human biology and social behavior

Experts suggest that the transition to autumn significantly impacts human biology and social dynamics. Research from the University of Pennsylvania and the National Sleep Foundation indicates that the drastic reduction in light exposure—from approximately 100,000 lux in summer to just 2,000 lux in November—triggers hormonal shifts, including increased melatonin and decreased serotonin. This can lead to fatigue, reduced social motivation, and seasonal depression.

These biological changes contribute to the phenomenon known as ‘cuffing season,’ where individuals seek closer romantic connections or increased stability to cope with the changing environment. Clinicians describe this as a co-regulation reflex, where the nervous system seeks a ‘secure base’ rather than social excitement.

Beyond biology, autumn has evolved into a distinct aesthetic centered on ‘cocooning’ rituals, such as home-based comfort and nature-focused activities. While these rituals can help combat seasonal melancholy and provide a necessary pause after summer, psychologists warn that the social media portrayal of autumn as a perfect aesthetic can create undue stress.