From the comments here, it seems few people read the article. This one is worth it; informative and well well written.
People sleep in different ways. Here are some pictures of things related to sleep. Sleep is poorly studied we should study it more.
The thermoregulation and serotonin studies were helpful.
From the HN Guidelines (which I recommend reading):
> Please don't comment about the voting on comments. It never does any good, and it makes boring reading.
https://news.ycombinator.com/newsguidelines.html
If it bothers you this much, you're better off deleting your comment.