> I’ve always felt fine despite sleeping 5 hours This is part of it, I think. In Why we Sleep, Dr. Walker specifically mentions that we often don't realize how

> I’ve always felt fine despite sleeping 5 hours This is part of it, I think. In Why we Sleep, Dr. Walker specifically mentions that we often don't realize how sleep deprived we truly are. Given the fact that, if you rounded the percentage of people who have the mutation needed for less sleep, there's an effectively 0% chance of you having it, I'd say that's what's coming into play here.