좋은 수면, 좋은 학습, 좋은 삶 (2012)

Sleep is fundamental to cognitive function, memory consolidation, and creativity, yet modern society's artificial schedules and sleep deprivation have become barriers to human potential and health. Free running sleep—sleeping when naturally tired and waking without alarms—emerges as the ideal approach to align with individual circadian rhythms and optimize learning, productivity, and well-being. Understanding sleep's biological mechanisms and addressing sleep phase disorders through light exposure, exercise, and natural sleep timing is critical for reversing the neurological and metabolic damage caused by chronic sleep loss.