Claims about Chennai naps

A three-week treatment providing information, encouragement, and sleep-related items increased sleep quantity by 27 minutes per night without improving sleep quality. Increased night sleep had no detectable effects on cognition, productivity, decision-making, or psychological and physical well-being, and led to small decreases in labor supply and thus earnings. In contrast, offering high-quality naps at the workplace increased productivity, cognition, psychological well-being, and patience.

That is from a new NBER working paper by Pedro Bessone, Gautam Rao, Frank Schilbach, heather Schofield, Mattie Toma.