Pregnancy is one of the periods when sleep is both most necessary and most difficult to obtain. Nausea in early pregnancy, gastroesophageal reflux, frequent urges to urinate, back pain, heavy legs, and of course a belly that grows week by week: all these factors fragment nights and exhaust future mothers. It is estimated that up to 80% of pregnant women suffer from insomnia or sleep disturbances at some point during their pregnancy. However, a few simple adjustments — starting with the sleeping position at night, the right pillow, and the appropriate mattress — can radically transform the quality of your nights.

This article is not intended to replace the advice of your midwife or doctor. It provides practical keys to adapt your sleep environment at each stage of pregnancy.

Why does pregnancy disrupt sleep so much?

From the first trimester, hormonal upheavals — particularly the rise in progesterone — cause increased daytime drowsiness, but paradoxically a lower quality of nighttime sleep. The breasts become sensitive, the first nausea can occur at night, and anxiety related to pregnancy begins to appear.

In the second trimester, fatigue tends to stabilize, and many women regain more restorative sleep. This is also when the belly starts to become noticeable, making usual positions less comfortable.

In the third trimester, difficulties intensify. The weight of the belly puts pressure on the back and pelvis, compression of the inferior vena cava can cause discomfort when lying on the back, and the baby — increasingly active — does not always respect its mother’s sleep schedule. Cramps, restless legs syndrome, and nighttime reflux add to this picture.

Understanding these mechanisms allows for better selection of bedding equipment and adaptation of bedtime routines over the months.

What position should you adopt to sleep while pregnant?

The left side position: the reference

The best position for sleeping while pregnant is undoubtedly on the left side. It promotes blood circulation and relieves the inferior vena cava, the large vessel that returns blood from the lower limbs to the heart. By avoiding compression of this vessel, the risk of discomfort, leg swelling is reduced, and the supply of oxygen and nutrients to the placenta and baby is optimized.

Some experts recommend the left side as it notably decreases blood pressure and promotes good blood circulation to the organs and the baby.

Knees slightly bent

Health professionals recommend that pregnant women sleep on their side with one or two knees bent, which can help support the back. This “fetal” position reduces tension on the lumbar spine, often strained by the shift in the center of gravity due to the weight of the belly.

Can you sleep on the right side?

Sleeping on the right side is generally well tolerated, especially during the first two trimesters. In the third trimester, the left side remains preferable for the circulatory reasons mentioned above, but alternating between both sides during the night is entirely possible — and often inevitable.

Should you really avoid sleeping on your back?

From the second trimester, lying flat on your back for long periods is not recommended. The weight of the uterus can compress the inferior vena cava and the abdominal aorta. If you wake up on your back, there’s no need to panic: your body has probably already signaled discomfort (tingling, feeling unwell). Just reposition yourself on your side. A semi-sitting position can also be interesting if you suffer from nighttime gastroesophageal reflux.

The pregnancy pillow: an investment that changes everything

A pregnancy pillow — also called a maternity cushion or body pillow — is designed to simultaneously support the belly, back, hips, and knees when lying on your side. It effectively replaces the sometimes unstable stacking of regular pillows.

The different shapes available

The U-shaped pillow is the most comprehensive: it wraps around the entire body, providing both back and belly support at the same time. Ideal from the second trimester, it does take up considerable space in the bed and may hinder the partner.

The C-shaped pillow (or half-moon) is more compact. It slips between the knees and under the belly. Easier to move and reposition during the night, it is very suitable for women who frequently change positions.

The corner pillow or triangular wedge pillow is more targeted: it is mainly placed under the belly for support or behind the back to stabilize the side position. Less bulky, it can be used from the first trimester.

The ordinary long pillow (or body pillow) is a simplified and economical version: a long rectangular pillow to place between the knees or slide behind the back. Less ergonomic than specialized models, but perfectly sufficient in early pregnancy.

What to pay attention to when buying?

The filling determines long-term comfort. Polyester fiber fillings are the most common and accessible. Natural latex or microbead models offer better shape retention but are heavier and more expensive. Check that the cover is removable and machine washable: this is an essential criterion for hygiene during and after pregnancy.

The firmness should be sufficient to actually support the belly and back, without being so rigid that the pillow becomes uncomfortable. A pillow that is too soft flattens quickly and loses its effectiveness.

Finally, consider the size: a complete U-shaped pillow can measure up to 150 cm long, which requires a double bed of at least 160 cm wide to remain comfortable for both partners.

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The mattress: the foundation of restorative sleep during pregnancy

What firmness to choose?

A firm to medium-firm mattress is generally recommended during pregnancy. A mattress that is too soft does not sufficiently support the lower back and allows the pelvis to sink, creating excessive curvature that can be particularly painful from the second trimester. Conversely, a mattress that is too firm does not adapt to the curves of the body lying on its side and creates pressure points at the hips and shoulders.

So-called “hybrid” mattresses, which combine several technologies like foam and latex, foam and pocket springs, are particularly suitable. They combine the support of springs with the pressure absorption capability of a foam or latex comfort layer. The result is a mattress that properly maintains the spine in a lateral position while remaining welcoming for the hips and shoulders.

Firm does not mean hard

It is crucial not to confuse firmness with hardness. A quality firm to medium-firm mattress should support without being uncomfortable. The quality of the materials — foam density, type of latex, diameter and number of springs — makes all the difference. An entry-level mattress may be firm but without any surface softness; a mid-range or high-end model offers a true balance between support and comfort.

Mattress topper: an intermediate solution

If your current mattress is too firm or too soft, purchasing a mattress topper can be enough to correct the issue without investing in a new mattress. A few centimeters thick natural latex topper softens a mattress that is too rigid; a high-density foam topper improves the support of a mattress that is too soft. This is a particularly interesting solution if you have recently acquired a mattress and do not wish to replace it during pregnancy.

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Should you change your mattress during pregnancy?

It is not systematically necessary to change your mattress. If your mattress is less than 7 to 8 years old, shows no visible sagging, and provided satisfactory support before pregnancy, it may still be suitable. However, if you wake up with back pain or notice that you “roll” toward the center of the bed, it is a warning sign. An end-of-life mattress, in particular, should be replaced: pain related to poor bedding is amplified by the postural changes of pregnancy.

Additional tips for improving sleep during pregnancy

Beyond the mattress and pillow, several habits can make a real difference in daily life.

Slightly elevating the head of the bed (with wedges under the bed frame or by choosing an adjustable base) can alleviate nighttime reflux in the third trimester without having to sleep completely semi-sitting.

Avoiding heavy meals in the evening is classic advice but particularly relevant during pregnancy, where digestion is slowed by progesterone and the uterus progressively compresses the stomach.

Maintaining a cool temperature in the bedroom helps counterbalance the slight increase in body temperature related to pregnancy. Between 17 and 19 °C, the bedroom naturally promotes falling asleep.

Limiting fluid intake in the evening can reduce the number of nighttime trips to the bathroom, particularly frequent in late pregnancy due to the pressure of the uterus on the bladder.

Finally, remember that sleep disturbances during pregnancy are temporary. A well-thought-out sleep environment — suitable pillow, quality mattress, good temperature — will not eliminate all discomforts but can significantly reduce their impact on your nights.

For more on general sleep improvement strategies, check out our section dedicated to tips for better sleep .

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Frequently asked questions about sleep during pregnancy

From which month should you avoid sleeping on your back?

As a general rule, lying flat on your back becomes progressively discouraged starting from the fourth month of pregnancy (beginning of the second trimester). It is at this stage that the uterus becomes large enough to exert notable pressure on the inferior vena cava, the large vessel located in front of the spine that returns blood from the lower limbs to the heart. This compression can cause a drop in blood pressure in the future mother, resulting in dizziness, palpitations, or a feeling of discomfort. There is no need to panic if you occasionally wake up on your back — your body will signal discomfort before it becomes problematic — but it is better to get used to falling asleep on your side from the second trimester. Using a pregnancy pillow behind your back can help you stay in a lateral position all night.

Can you use a pregnancy pillow from the first trimester?

Yes, and it is even advisable to start early to get used to the position and choose the model that suits you before the belly becomes really bothersome. In the first trimester, a simple long cushion slipped between the knees may suffice. If you tend to suffer from nighttime nausea or your breasts are particularly sensitive, a back support cushion can also provide welcome relief. The goal is to gradually identify your optimal position rather than waiting until the third trimester to adapt in a hurry.

Is a memory foam mattress suitable during pregnancy?

Memory foam has an undeniable advantage during pregnancy: it precisely adapts to the body’s curves and reduces pressure points on the hips and shoulders when sleeping on the side. However, it also has drawbacks to watch out for. First, memory foam tends to retain body heat, which can amplify the feeling of warmth already common during pregnancy. Second, a pure memory foam mattress may be too soft and not provide enough lumbar support if the density is insufficient. The best compromise is often a hybrid mattress combining a pocket spring base (for support) and a comfort layer in memory foam or latex (for body welcome). If you opt for an all-foam memory foam mattress, prioritize a density of at least 50 kg/m³ and a medium-firm firmness.

How can you reduce nighttime back pain during pregnancy?

Nighttime back pain is one of the most common sleep disorders starting from the second trimester. Several approaches can be combined to alleviate them. From a postural standpoint, sleeping on the left side with a pillow wedged between the knees and another supporting the belly significantly reduces tension on the paravertebral muscles and pelvic ligaments. A good quality medium-firm mattress is essential: a mattress that is too soft allows the pelvis to sag, exaggerating lumbar lordosis. If your mattress is too firm, a natural latex topper can soften the surface while maintaining support. During the day, avoid standing or sitting for long periods in poor posture, and practice gentle exercises recommended by your healthcare professional (prenatal yoga, swimming) to strengthen the back and pelvic floor muscles.

Is restless legs syndrome common during pregnancy?

Yes, restless legs syndrome (RLS) — this irresistible urge to move the legs, often accompanied by unpleasant tingling or prickling sensations — is significantly more common in pregnant women than in the general population. It particularly affects the third trimester. Iron or folic acid deficiencies can be a cause or aggravating factor during pregnancy; therefore, it is useful to discuss this with your doctor or midwife for appropriate assessment. Practically, light stretching of the calves and thighs before bed, fresh and light bedding, and avoiding stimulants in the evening can help limit episodes. If symptoms are severe and significantly disrupt sleep, a medical consultation is necessary.