Walker's response to the criticism can be found here: https://sleepdiplomat.wordpress.com/2019/12/19/why-we-sleep-responses-to-questions-from-readers/ https://s

Walker's response to the criticism can be found here: https://sleepdiplomat.wordpress.com/2019/12/19/why-we-sleep-responses-to-questions-from-readers/ https://sleepdiplomat.wordpress.com/2019/12/19/why-we-sleep-...