Late-Night TV's Sleep Drain Hits Stock Markets

The rise of streaming services and their midnight 'dump releases' of new shows has led to a widespread phenomenon of binge-watching, which researchers now link to observable impacts on financial markets. Studies reveal that market returns tend to decrease significantly on the day following the release of popular late-night television series. Specifically, the S&P 500 index has shown an average decline of 0.25% after these releases.

This effect appears most pronounced in larger-capitalization stocks, a finding that contrasts with previous research on trader fatigue. Researchers speculate that sophisticated institutional investors, who often operate on less sleep, may be more susceptible to the cognitive disruptions caused by extended viewing sessions. This could lead to impaired decision-making and an asymmetric allocation of cognitive resources, ultimately affecting trading outcomes.

While the exact number of traders affected is unknown, the cumulative annual decrease in market returns is estimated to be around 2.3%. The study's findings suggest a novel explanation for lower returns, pointing to the emerging cultural trend of late-night TV consumption and its potential deleterious effects on investor cognitive abilities.