"This is the first step along the road to obscuring yourself entirely. The ability to control your metabolism is the foundation upon which we will build. Once you have mastered this, I will teach you Emptiness, which depends on this ability.
"In hibernation trance you will, to all appearances both physical and in the Force, appear dead. Powerful forces-sensitives may still detect your life, and someone doing a detailed physical examination will find you are alive, but the trance reduces the chance you are discovered. If you face a powerful foe where defeat seems certain, you can enter hibernation trance to appear dead as a last-resort chance of escape. If you are mortally wounded, you might be able enter the trance as a way to buy time for friends or allies to bring you to medical care. As I said, it is a last-resort option, but it may well save your life when there is little or no hope.