Kodansha, Published December 20, 2024 Price: 900 yen + tax Contents: ● What has humanity thought about sleep? ● The era when sleep was interpreted as a "simulated death experience" ● Why is catching up on sleep meaningless? ● The difference between the sleeping brain and the waking brain ● Was sleep not "for resting the brain"? ● "Sleep pressure" and "circadian clock" that regulate sleep ● Do creatures that don't sleep exist? ● The "true form" of living things is their sleeping form ● The reason why we must sleep... and more