Fetal movement at night after an ultrasound is generally normal, if there is a significant increase in fetal movement after a significant decrease in the need for timely medical attention. Fetal movement at night after anomaly is considered to be caused by the circadian rhythm of the fetus, the fetus sleeps more in the daytime and is more active at night, so that the fetus will feel more movement at night; and pregnant women are in a relatively calm state during sleep, which is more conducive to the perception of the fetal movement, and during the daytime in the midst of work, life, or study, not enough attention to the fetal movement, and so may also miss some fetal movement. During pregnancy, pregnant women should monitor the fetal movement every day, if the fetal movement slightly increased by changing the position to the left lateral lying position to increase uterine blood supply to alleviate fetal hypoxia caused by increased fetal movement; if the fetal movement increased significantly after a significant decrease in the need to go to the hospital in a timely manner, to avoid the occurrence of intrauterine fetal hypoxia.