Bibliography (6):

1. Is Matthew Walker’s Why We Sleep Riddled with Scientific and Factual Errors?

2. Matthew Walker’s Why We Sleep Is Riddled with Scientific and Factual Errors

3. Alexey Guzey’s homepage

4. https://www.gatesnotes.com/Holiday-Books-2019

5. https://sleepdiplomat.wordpress.com/

6. https://bookmarks.reviews/reviews/all/why-we-sleep/