Sleeping suddenly a stream of liquid out, if it is the male external genitals to consider the phenomenon of spermatorrhea, if it is the female vagina may be ovulation, or gynecological diseases caused by a stream of liquid out of the anus, it may be anorectal diseases. 1. spermatorrhea: men enter puberty, androgen secretion is strong, no recent sex may occur spermatorrhea, is a normal physiological phenomenon. 2. Ovulation: women in the ovulation period, the uterus cervix vaginal secretion will increase, may cause sleep suddenly a stream of liquid from the vagina. 3. Gynecological diseases: such as vaginitis, cervicitis and other diseases, may also cause a sudden flow of liquid from the vagina during sleep. 4. anal and intestinal diseases: such as hemorrhoids proctitis, sinusitis, rectal cancer and other diseases, can also cause sleeping suddenly a liquid out of the anus phenomenon. Sleeping suddenly a liquid outflow may have other reasons, if it is a physiological phenomenon do not need treatment, if there is a disease should go to the hospital in time to check, follow the doctor’s instructions for treatment.