Personal anecdote here. I've read his book. It's good, it's interesting, and it made me realise how much more I should try to get more and better sleep. I'm a night person. For months I tried each and every technique out there to move my sleep schedule back since I have to wake up in the morning against my natural rhythm.
I started panicking and I went from 4-6h sleep per night + 8-10h on weekends to 2-4h during the week and about 6h on weekends. My whole life took a turn for the worst until I made the decision to stop the madness and go back to my previous, insufficient, sleep schedule.
This is not ideal by a long shot. I'm permanently sleep deprived, but at least not to the point where I can't even function.
Shouldn't you just have a fixed, later bedtime. To maximize REM sleep etc?
I still don't buy this as an idea, an unchangeable genetic (?) marker that defines "night person" or "morning person". I think we make choices and habits, and these are really just a part of personality.
In a lot of ways an early bedtime, or an average bedtime, is preferable to staying up to the wee hours, but given the context I couldn't see the benefits until I had experienced it myself for a few months. So in my opinion, if there is some kind of genetic marker for chronatype, it's either not very influential, only expressed in a subset of the populace or largely BS.
On Peter Attia's podcast, he address a bunch of the criticism as well. The second edition of the book has been updated to correct errors.
Blogs are immediate and "free". Books take time and cost money.
Think CliffsNotes (or some other equivalent) study guides. Why read the whole text and learn all the nuance and details, when you can just get straight to a particular hearline narrative
Matthew Walker's book is the one I'd go to.
Always find it weird how blog oriented a lot of information has become.
If you want to know something... why not find the best researcher in the field and get their book.