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Construction method refers to the method used to construct a building.
At present, we lack of a unified accepted theory to explain why we sleep, the scientists will focus on what is sleep, sleep and deal with disturbance, such as anxiety, restless leg syndrome (busy leg disease, characterized by uncontrollable to keep swinging calf or the thigh) and sleep apnea. They found that most of the mammals, with the exception of dolphins and whales may sleep be clearly divided into two stages, one is the eyes turn quickly, also is the famous quick eye movement sleep (shallow sleep), while another phase directly referred to as the eye movement sleep (sleep). Humans usually complete the transition from rem sleep to non-rem sleep in 90 minutes. But according to some observations, we actually spend much more time in rem sleep than this.