Features of sleep-wake cycle in physiological and abnormal pregnancy

The article presents the characteristics of the daily cycle "wake-sleep" in women with physiological pregnancy and the risk of interruption. Significant differences in the sleep structure in normal and abnormal pregnancy have been established. It has been detected that changes in nocturnal sleep in abnormal pregnancies were characterized by reduced quantity and increased duration of the sleep cycles, multiple segmentation of sleep phases, lots of awakenings, and increased motor activity during sleep, increased number of apnea compared to normal pregnancy.