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Very interesting writing, I wonder if the people sleeping just 6 hours (who are in the best condition acc. to a later explanation) wouldn't be because they have a cause in their life? They have a purpose that is why they get up early and motivated enough to work on it. For people with more sleep might be less motivated in average?

Interesting topic nevertheless.

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I find this to be true. I sleep in 90-minute sleep cycles. I time my morning alarm thus (adding 10-15 minutes for initial spindown).

When I wake up, even if it's 4.5hrs, my brain is typically going a mile-a-minute. There's so much I want to accomplish, it's hard to be mindful and go back to sleep (so I rarely do, especially if it's 'only' 6hrs vs. the 7.5 I seem to need).

I looked back at my sleep logs, and I've slept longer than 7.5 only a handful of times in 2020, and it's always correlated with several nights of 1.5, 3, or 4.5 hrs.

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