This article points to some sources, looks like the same ones referred to in 'Why We Sleep': https://www.theatlantic.com/health/archive/2017/12/even-small-amoun

This article points to some sources, looks like the same ones referred to in 'Why We Sleep': https://www.theatlantic.com/health/archive/2017/12/even-small-amounts-of-alcohol-impair-memory/548474/ https://www.theatlantic.com/health/archive/2017/12/even-smal... Studies cited: https://www.ncbi.nlm.nih.gov/pubmed/12683478 https://www.ncbi.nlm.nih.gov/pubmed/12683478 https://www.bmj.com/content/357/bmj.j2353 https://www.bmj.com/content/357/bmj.j2353