- Effect of coffee on sleep: I didn't particularly have problems with sleep but I have stopped drinking way too much coffee, specially late in the day, after understanding its effect on sleep suppression and the ill effects that causes.
- Importance of sleep: I try and get enough sleep and try to maintain a steady sleep cycle as much as I can.
- 2 hours of lost sleep is lot more than 2 hours of lost sleep(say by waking up early for a meeting): Sleep comprises of multiple REM and NREM cycles through the night, some cycles are heavier on REM while other heavier on NREM. And, both are very important and serve different functions. If you miss a couple of hours of sleep, its effect is lot more than just a couple of hours of lost sleep because you didn't get enough of either REM or NREM sleep. And, its not something you ever can get back.
- I used to think its something to be proud about, to be able to function without sleep or by skipping sleep etc. (specially when I was younger), now I think its just stupid :)
Apart from these, its a fascinatingly interesting read, I definitely recommend the book.
I've mentioned the book on several other threads , so I'll avoid repeating here.
Along the same lines of expanding the ability of your body/mind, one that I'm currently reading is "What doesn't kill us" . Pretty fascinating to think that we have a lot more control over our immune system than originally thought.
I'd highly recommend last year's "Why We Sleep"  for more info on memory performance and how it's impacted far more that you'd suspect by full (and quality) sleep, which is in turn impacted far more than you'd suspect by alcohol and stress (not to mention kids).
I've mentioned the book on several other thread , so there's plenty of opinions there if you're interested in knowing more.
His interview on Joe Rogan is a good summary: https://www.youtube.com/watch?v=pwaWilO_Pig
He covers everything from why we sleep (obv), naps, melatonin, etc. I've just finished it and really enjoyed it.
The Promise of Sleep is an okay book, but it is almost 20 years old now and it shows.
I have read both books and it is remarkable how much more we learned in the time between them.
Most of my life I did the typical not getting enough sleep and then binging on the weekend, which doesn't work well at all. Since reading "Why We Sleep" though, I've changed my lifestyle to prioritize getting quality sleep every single night. That book was pretty eye-opening in obliterating a lot of myths I believed about sleep and then teaching my how complex and important it is, indeed it is just as important as waking time if not more. The idea that time spent asleep is "wasted time" is now absurd to me, as so many bad things happen when you short sleep.
Since getting quality sleep regularly it's been like unlocking a superpower: retaining more information, better progress with strength training and skill-based hobbies, more solid emotional balance and way more motivation / inspiration at work.
Can't recommend that book enough.
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