Can/May/Must

To begin with, Dreams are mysterious series of thoughts and images we experience while asleep. While their purpose remains a mystery, scientists offer theories. Some scientists fail to think that dreams allow us to solve problems, to create new ideas and to find answers to the most complicated questions. Dreams be bizarre, as some brain areas are active while others, like logic, are not active at all. Our dreams depend on our emotional state as well. When we are depressed, we usually have dreams which make our sleep disturbed. When we fear something, we have a nightmare. We often dream about those we think about during the day, the Chinese say: "What you think during the daytime you will dream at night." , we have common dream themes include flying, being chased, falling, or not being able to move. Dream interpretation books offer explanations, but we really interpret these visions? Normal sleep is crucial for health and well-being. People, , need 8 hours of sleep per night. Insomnia be caused by factors like noise, anxiety, or existing. If a person has missed a lot of sleep, he be tired, become absent-minded and make many mistakes.