Your body

Is it dangerous to sleep on your back while pregnant?

Checked against the sources listed on this page. Not reviewed by a clinician. Last updated 5 November 2026. How we check.

Partly true

In the third trimester (from 28 weeks), going to sleep on your side is recommended. Earlier in pregnancy, back sleeping is fine.

Later in pregnancy, lying on your back lets the heavy uterus press on major blood vessels. Studies found that going to sleep on your back after 28 weeks is associated with a higher risk of stillbirth.

Left or right side are both fine. If you wake up on your back, just roll over. What matters most is the position you fall asleep in.

References

  1. Cronin RS et al. Maternal going-to-sleep position and late stillbirth: individual participant data meta-analysis. EClinicalMedicine, 2019
  2. NHS: Reducing the risk of stillbirth
  3. Tommy’s: Safe sleeping and baby movements

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