Comfort matters because sleep can already be challenging during pregnancy. A person who is constantly worrying about maintaining one exact position may find it harder to relax.
A supportive pillow between the knees can help keep the hips more comfortable. A small pillow under the abdomen may reduce pulling sensations, while a pillow behind the back can provide support and make it easier to remain on the side.
Some pregnancy pillows are designed to support the abdomen and legs at the same time. They are not medically necessary for everyone, but they may improve comfort.
Pregnant people who experience severe breathlessness, faintness, chest pain or other worrying symptoms should contact their healthcare provider rather than attempting to solve the problem by changing sleeping positions alone.
The overall message is reassuring: side sleeping is generally encouraged later in pregnancy, but both sides can be used. The goal is to support comfortable sleep and follow appropriate maternity guidance, not to remain rigidly fixed in one position.
Chapter 9: Can Sleeping on One Side Cause Shoulder, Hip or Arm Pain?
Although side sleeping can be helpful for some health concerns, remaining in one position for long periods can create pressure on certain parts of the body.
The shoulder is a common area of discomfort. When a person lies on one side, part of their body weight rests on the shoulder and upper arm. If the mattress is too firm or the shoulder is positioned awkwardly, pressure may build up during the night.
Some people wake with a numb arm or tingling fingers. This may happen when nerves or blood vessels are compressed by the sleeping position. Changing position usually relieves temporary pressure, but persistent numbness or weakness should be evaluated.
The hips can also become uncomfortable. A person with sensitive hip joints may experience pressure on the side touching the mattress. Others may notice tightness around the lower back, pelvis or outer thigh.
The problem may be more noticeable when the mattress does not provide enough cushioning or when the pillow is too high or too low.
A pillow that is too thick can tilt the head upward, while one that is too thin may allow the head to drop toward the mattress. Either situation can strain the neck.
The goal is to keep the head and neck reasonably aligned with the rest of the spine. A pillow should fill the space between the shoulder and the head without forcing the neck into an uncomfortable angle.
A pillow between the knees can also help. It may reduce the tendency for the upper leg to pull the pelvis forward, helping some side sleepers maintain a more comfortable position.
People with shoulder pain may find it useful to avoid placing their full body weight directly on the painful shoulder. Some may prefer sleeping on the opposite side or using a supportive pillow to reduce pressure.
There is no requirement to stay on one side all night. Most people naturally change position during sleep, and movement can help reduce prolonged pressure on one area.
If pain repeatedly wakes someone, lasts throughout the day or is accompanied by weakness, persistent numbness or reduced movement, it should not automatically be blamed on the mattress. Medical assessment may be needed to identify the underlying cause.
Chapter 10: Why Your Pillow and Mattress Matter as Much as Your Sleeping Side
People often focus on whether they should sleep on the left or right side, but the support provided by the mattress and pillow can be just as important for comfort.
A mattress that is too firm may create pressure around the shoulder and hip. One that is too soft may allow the body to sink unevenly, potentially affecting spinal alignment.
There is no single mattress firmness that is ideal for everyone. Body weight, sleeping habits, existing pain and personal comfort all influence what feels supportive.
Side sleepers often benefit from a mattress that allows the shoulder and hip to sink slightly while keeping the rest of the body supported. The objective is not to make the body perfectly straight but to avoid uncomfortable twisting or excessive pressure.
Pillow height is another important factor. A side sleeper generally needs enough pillow support to fill the space between the head and mattress. The right height depends partly on shoulder width and mattress softness.
A person with broad shoulders may need a thicker pillow than someone with a narrower frame. However, the best choice is the one that keeps the neck comfortable and prevents the head from tilting excessively.
Body pillows can also be useful. They allow a person to rest an arm and leg against a supportive surface, which may reduce pressure and make side sleeping easier.
For people with nighttime reflux, a different type of support may be useful: a wedge pillow or a method of elevating the upper body.
Simply stacking several ordinary pillows under the head is not always ideal. It can bend the neck and upper body in an uncomfortable way. A wedge designed to elevate the upper torso may provide more consistent support.
Clinical guidance for GERD includes head-of-bed elevation as a possible measure for people with nighttime symptoms. The American College of Gastroenterology also discusses avoiding meals close to bedtime and other lifestyle changes as part of reflux management.
The right combination of mattress, pillow and sleeping position should make it easier to remain comfortable without forcing the body into an unnatural posture.
Chapter 11: Other Habits That May Matter More Than Your Sleeping Position
It is easy to focus on one sleeping position because it seems like a simple solution. However, people who experience nighttime reflux may benefit from examining their evening routine as well.
Meal timing is one of the most important factors. Going to bed immediately after a large meal may increase the likelihood of discomfort. The stomach needs time to process food, and lying down too soon can make reflux more troublesome.
The American College of Gastroenterology suggests avoiding meals within two to three hours of bedtime for people with GERD symptoms.
Eating smaller meals may also help some people. A very large meal can leave the stomach feeling overly full and may contribute to reflux. Some people find that having a lighter evening meal reduces nighttime symptoms.
Food triggers vary. Fatty meals, chocolate, peppermint, alcohol, coffee, spicy foods and acidic foods may aggravate symptoms in certain individuals. Not everyone reacts to the same foods, so it is more useful to identify personal triggers than to follow an unnecessarily restrictive diet.