A health book explaining how the body's organs cooperate during sleep. [Title] What Happens in Your Body While You Sleep: Sleep's Secret Symphony [Author] Masaki Nishida [Publisher] Soshisha [Price] 2000 yen (excluding tax) Thank you for viewing! The top part of the back cover is slightly darkened, but overall, it's in very good condition. There are no markings. Please feel free to comment if you have any other questions.