Some other people far away from the unit, sleep late,起得早often supplement the use of sleep on the way to work. Roughly divided into people's sleep "non-rapid eye movement sleep" and "rapid eye movement sleep" in two phases, the previous stage, and can be divided into "shallow sleep" and "deep sleep" the two processes, the two process several times in the sleep cycle. It is only in his sleep has experienced a number of "deep sleep" process, can ful...