Lookup the research of Matt Williams, Gina Poe, Rajkumar Dasgupta, Rebecca Robbins, Indira Gurubhagavatula, and many many others. The article is not directed at an audience who wants to read the scientific evidence to support the claims - just the claims themselves.

There’s been a ton of research in sleep the last 10 years and it’s easy to find the studies and results.