You have overworked your brain. You have forced it to be active day and night, even in periods of rest: thoughts, memories, fantasies, concepts, emotions, sensations. . . . You do not know how to give your brain a chance to really rest. You continue to think and reflect, yet these reflections are often useless. Even when your thoughts bring depression, anger, and despair, you keep on thinking, and thinking. . . . Sound sleep eludes you, for even in your dreams, you continue to suffer. You go to the doctor for pills, but these give only temporary relief at best, and may become just another way of abusing your brain. . . . The fact is that you must learn how to rest. You must learn how to be kind to your brain.

Thich Nhat Hanh, Thich Nhat Hanh by Jean-Pierre Cartier, Rachel Cartier