This Book of Sleep explains how human sleep is work. Our sleep divided into two cycles — REM and N-REM. Those cycles repeating one after another during the sleep. The book is also divided into two parts ( one for REM and one for N-REM cycle). Each part presents the process which is happening in your brain and body as you falling asleep. Instead of the text in this book I made an emphasis on the paper textures and thickness so it gives you an unusual experience of learning through touch.