I've seen this posted all over the internet to great acclaim, and honestly, it just feels feverish and desperate to me, grasping at tiny points as if they refute the central thesis.
For example, the point that you linked to says that the official recommendations on sleep are "7 to 9 hours", which Walker simplified to "an average of 8 hours". I don't see how this simplification is so bad. The point is that these numbers are all much higher than the 5-6 hours many people claim to subsist on. It doesn't even change the numbers that much: slightly more than half of people sleep less than 8 hours, and slightly less than half of people sleep less than 7 hours. This nitpick does not refute the central point that having 5-6 hours of sleep generally impairs you, it only takes aim at phrasing.
I find point #2 (of 5) in this article especially laughable. Here it's claimed that sleep deprivation is actually a good thing, because it can be used as a temporary treatment for severe depression. Under this logic, bulimia is a healthy habit because you should induce vomiting after being poisoned.
For example, the point that you linked to says that the official recommendations on sleep are "7 to 9 hours", which Walker simplified to "an average of 8 hours". I don't see how this simplification is so bad. The point is that these numbers are all much higher than the 5-6 hours many people claim to subsist on. It doesn't even change the numbers that much: slightly more than half of people sleep less than 8 hours, and slightly less than half of people sleep less than 7 hours. This nitpick does not refute the central point that having 5-6 hours of sleep generally impairs you, it only takes aim at phrasing.
I find point #2 (of 5) in this article especially laughable. Here it's claimed that sleep deprivation is actually a good thing, because it can be used as a temporary treatment for severe depression. Under this logic, bulimia is a healthy habit because you should induce vomiting after being poisoned.