It's quite long. I watched 15 minutes, then read the key takeaways. It is interesting. More research required. Gwern made some personal d+sleep observations a l

It's quite long. I watched 15 minutes, then read the key takeaways. It is interesting. More research required. Gwern made some personal d+sleep observations a little earlier, here... https://www.gwern.net/zeo/Vitamin-D https://www.gwern.net/zeo/Vitamin-D