Recent research, conducted by a team from the University of Auckland, has revealed that the risk of still-birth can be affected by the mother's sleeping position.
The study monitored 155 women who had late still-births and 310 women who had healthy pregnancies.
Those who slept on their back or the right side of their body had an almost double risk of still-birth when compared with those who slept on their left, but this was only the case for almost four in 1,000 women.
Commenting on the research, Daghni Rajasingam, spokeswoman for the Royal College of Obstetricians and Gynaecologists, said: "There are many factors which are linked to stillbirth including obesity, increasing maternal age, ethnicity, congenital anomalies and placental conditions. A significant number are unexplained.
"This small scale study looks at another possible factor, however, more research is needed into sleep patterns before any firm conclusions over sleeping positions can be made.
In the meantime, women should speak to their midwives if they are concerned."
Sleeping on the left of the body aids blood flow to the baby by ensuring that the major blood vessels of the mother are unimpeded by a heavy womb.