The confidence intervals on their hazard numbers are so broad as to make it impossible to make any particular conclusion beyond “looks like 7 hours is best, probably, all things being equal”. Then they forget about their confidence intervals in the graphs on pg. 134.
Additionally, the paper appears to completely disregard confounders. Sleeping 9 hours per night every night is probably correlated with all-cause mortality because anybody who sleeps 9 hours per night on average is probably already sick in some significant way. That’s why they sleep so much. It’s not the sleep that makes them sick. This says nothing about the causal claim that the median human should be getting enough sleep.
Unfortunately I can’t really link to the contents of a book, but this book makes a strong case that getting enough sleep reduces all-cause mortality.
Also I would re-emphasize that 100% of the advice I gave in this post was meant to be easily empirically testable. If you actually feel better on 4 hours of sleep per night than 7, then more power to you.
I have some ideas and I am working on getting conclusive answers. Doing a lot of tracking variables and trying things. I don’t want to be throwing around my theories (that could be blatantly wrong) but I can pm anyone interested.
What makes you think that it increases all-cause mortality?
According to https://web.archive.org/web/20150221042754/http://www.byz.org/~david/neuro/kripke.pdf sleeping 8 hours of sleep is correlated with higher all-cause mortality than sleeping 4 hours.
The confidence intervals on their hazard numbers are so broad as to make it impossible to make any particular conclusion beyond “looks like 7 hours is best, probably, all things being equal”. Then they forget about their confidence intervals in the graphs on pg. 134.
Additionally, the paper appears to completely disregard confounders. Sleeping 9 hours per night every night is probably correlated with all-cause mortality because anybody who sleeps 9 hours per night on average is probably already sick in some significant way. That’s why they sleep so much. It’s not the sleep that makes them sick. This says nothing about the causal claim that the median human should be getting enough sleep.
Unfortunately I can’t really link to the contents of a book, but this book makes a strong case that getting enough sleep reduces all-cause mortality.
Also I would re-emphasize that 100% of the advice I gave in this post was meant to be easily empirically testable. If you actually feel better on 4 hours of sleep per night than 7, then more power to you.
Good book. My current top sleep recommendation book.
I am a lucky 4hr one. But only in summer
This surprised me. Any idea about what’s so different about you summers vs the rest of the year? How many hours is the rest of the year?
Winter 6-8hrs.
I have some ideas and I am working on getting conclusive answers. Doing a lot of tracking variables and trying things. I don’t want to be throwing around my theories (that could be blatantly wrong) but I can pm anyone interested.