Interesting article, thanks! It seems to me that all forms of sleep in the wild would be natural... being on a bed being "unnatural"? I wonder if Grok really had all that good of sleep, length wise. In groups I have read that the natural sleep cycle would wake some at different times allowing for a natural guard rotation to keep a watch over the group so to speak.
As for me I like sleeping on the incline, I have slept on heated floors in Asia and really liked it. But I have my beds raised 4 inches at the head and love this!
Living the dream, inside a myth