In the insomnia specialist clinic, there are often people who consult the physician, he (she) almost every night dream, and the night to do dawn, is not a good sleep? To answer this question, first of all, we have to figure out what dreaming is all about. A person’s sleep, regardless of its duration, always consists of alternating periods of orthogonal sleep and heterogeneous sleep. If we do EEG and eye activity tracing during the whole sleep process, we can find that in the orthogonal sleep period, the EEG records high amplitude slow waves and the eye activity tracer shows that the eye rarely turns or turns very slowly; while in the heterogeneous sleep period, the EEG can see the electric wave distribution and the eye activity tracer shows that the eye turns 50-60 times per minute rapidly. If people in anaphase sleep were awakened, they said they were asleep and did not dream, while 85% of those awakened in anaphase sleep said they were dreaming and could clearly recall the dreaming situation. The results of this experiment were later confirmed by others who repeated the experiment several times. This shows that dreams only occur in anaphase sleep and not in ortho-phasic sleep. Each night, the orthogonal and heterogeneous sleep periods repeatedly alternate several times. Since everyone has several bouts of anaphase sleep, everyone dreams, and there are dreams every night. In other words, dreaming is a normal phenomenon. Some people say: “I didn’t dream last night”, which means that the person woke up from the orthogonal sleep period. Some people say, “I’ve been dreaming a lot lately,” which means that the person has been waking up from anomalous sleep a lot lately. Reading the text, it is easy to find the answer: dreaming every night means that the person wakes up from anomalous sleep every day. It also shows that dreaming is falling asleep, which does not mean that the quality of sleep is bad.