How pregnancy changes your sleep needs#

Pregnancy disrupts sleep in multiple ways that change across the three trimesters. In the first trimester, nausea, fatigue and frequent urination interrupt sleep. In the second, sleep typically improves, but the growing bump begins to limit comfortable positions. In the third trimester, back pain, heartburn, restless legs, frequent urination and the physical difficulty of turning over combine to make restful sleep a challenge.

The NHS and most sleep specialists recommend that pregnant women sleep on their left side, particularly from the second trimester onward. Sleeping on the left side promotes blood flow to the placenta and kidneys, reduces pressure on the inferior vena cava (the large vein that returns blood to the heart), and minimises swelling in the legs and feet.

What a pregnancy mattress needs to provide#

  • Pressure relief at the hip: The growing bump forces side sleeping, creating sustained pressure at the hip and shoulder
  • Lumbar support: The lumbar spine undergoes significant change in curvature as the centre of gravity shifts forward
  • Temperature regulation: Many pregnant women experience increased body temperature, making sleeping hot a significant problem
  • Good edge support: Getting in and out of bed becomes progressively more difficult in the third trimester — strong edges are essential
  • Appropriate firmness without being hard: Firm enough to support the lower back, soft enough to relieve hip and shoulder pressure

Medium to medium-firm is generally recommended throughout pregnancy. In the third trimester, as hip pressure becomes more significant with sustained left-side sleeping, some pregnant women find that going slightly softer (medium) provides better comfort — a mattress topper can be added if needed without buying a new mattress.

Best mattress types for pregnancy#

  • Hybrid: The best overall choice for pregnancy. Good pressure relief from the foam comfort layer; adequate lumbar support from the spring base; better temperature regulation than all-foam.
  • Medium-firm memory foam: Excellent for pressure relief at hip and shoulder, which intensifies in the third trimester. Be mindful of heat retention if you're sleeping hot.
  • Natural latex: Responsive, breathable and supportive. A good choice for pregnant women who sleep hot.

Helpful sleep accessories during pregnancy#

  • Pregnancy pillow: A U-shaped or C-shaped pregnancy pillow supports the bump, keeps the hips level and prevents rolling onto the back during the night. Many pregnant women find these transform their sleep quality in the third trimester.
  • Wedge pillow: A smaller triangular wedge under the bump provides targeted support without the bulk of a full pregnancy pillow.
  • Mattress topper: If your existing mattress is slightly too firm, a 5 cm memory foam topper can provide additional hip and shoulder cushioning for the duration of pregnancy.