It definitely does. In what few empirical studies on what makes programmers effective, sleep, is the primary contributing factor to low error rates [0][1]. Stre

It definitely does. In what few empirical studies on what makes programmers effective, sleep, is the primary contributing factor to low error rates [0][1]. Stress and overwork are probably close seconds. And some of these studies are cross-sectional across knowledge workers; iow, not just programmers. If you want to make it to your 40s and still be an effective IC you need to learn how to regulate yourself and follow a disciplined approach to work. Cognitive performance from chronic sleep deprivation takes years to show up. [0] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2656292/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2656292/ [1] https://arxiv.org/pdf/1805.02544.pdf https://arxiv.org/pdf/1805.02544.pdf