It is a archiving book of sleeping patterns. It is linked to four books and divided into nap and night nap. 15-30m was a nap to visualize the pattern of sleeping during the day.
Night sleep was divided into 1 hour, 4 hours, and 8 hours based on the average life time of 8 hours in humans.The size of a growing book is proportional to time. The book is composed of four test subjects with different gender and physical condition, and the book can observe different sleeping patterns.
Gold in Book Design 2020, Non-Pro