Sadly, human beings are in fact the only species that will deliberately deprive themselves of sleep without legitimate gain. (Location 40)
Sleep with both sides of the brain, or sleep with just one side and then switch. Both are possible, but sleep you must. Sleep is non-negotiable. (Location 1025)
the practice of natural biphasic sleep, and a healthy diet, appear to be the keys to a long-sustained life. (Location 1136)
Certainly sleep is not the only factor in the ripening of the brain, but it appears to be a significant one that paves the way to mature thinking and reasoning ability. (Location 1438)
