The common causes of excessive dreaming during pregnancy include: 1, anemia, after pregnancy without timely iron supplements, pregnant women’s dietary intake of iron can not meet the needs of their own and fetal growth and development, thus iron deficiency anemia, affecting the oxygen supply to brain tissue, blood supply and symptoms of excessive dreaming. 2, calcium deficiency, calcium deficiency will cause increased excitability of the nervous system, so that the quality of sleep is affected. 3, poor dietary habits, such as drinking strong tea, coffee, often overeating, extra meals before going to bed at night will affect the normal sleep quality of pregnant women, the difficulty of falling asleep, easy to dream or easy to wake up performance.