How Sleeping on Your Left Side Benefits Your Brain, Stomach, and Glymphatic System

 

The Benefits of Sleeping on Your Left Side

While many people naturally favor side sleeping, they may not be fully aware of its potential health benefits. Different sleeping positions can have varied effects on the body, with both positive and negative outcomes. Generally, it's best to sleep in whichever position feels most comfortable. However, if you experience issues like back pain, jaw discomfort, or indigestion, you might want to consider adjusting your sleep position. Sleeping on the left side, in particular, offers several notable benefits.

Advantages of Left-Side Sleeping

  1. Reduces Back Pain: Sleeping on your stomach can put a strain on the spine and lead to discomfort. Side sleeping, especially on the left side, helps keep the spine aligned naturally, which can alleviate pressure on the lower back.

  2. Decreases Snoring: When you sleep on your back, the tongue and soft palate can collapse backward, partially blocking the airway and causing snoring. Sleeping on your side can help keep the airway clear, reducing snoring and aiding those with sleep apnea.

  3. Improves Digestion: Sleeping on the left side may help ease gastrointestinal issues such as bloating, constipation, and heartburn. This position allows gravity to aid in the digestion process, as the stomach is naturally located on the left side of the body.

  4. Supports Brain Health: Research suggests that the brain clears waste more effectively while you sleep, and side sleeping may enhance this process. The glymphatic system, which helps remove waste from the brain, could be better supported by side sleeping, potentially reducing the risk of neurodegenerative diseases like Alzheimer’s and Parkinson’s. More research is needed to confirm these benefits in humans.

  5. Promotes Blood Flow During Pregnancy: For expectant mothers, side sleeping is recommended to improve blood circulation to the placenta, supporting overall health during pregnancy.

Tips for Transitioning to Side Sleeping

  • Choose the Right Pillow and Mattress: Select a pillow that supports your neck and aligns with your collarbone structure. A softer mattress may be better to prevent pressure on the shoulders and hips.
  • Use Pillows for Support: Place a pillow between your knees to support your hips and lower back, and hug a pillow to support your upper arm. Body pillows can help maintain your position throughout the night.
  • Train Yourself Gradually: Try sleeping on the couch, which may naturally encourage side sleeping due to its narrowness. For a more permanent solution, consider sewing a tennis ball onto the back of a shirt to prevent rolling onto your back.

Potential Drawbacks of Side Sleeping

Despite its benefits, side sleeping may not be ideal for everyone. Potential drawbacks include:

  • Shoulder and Hip Pain: A mattress that's too firm or too soft can increase pressure on the shoulders and hips, leading to discomfort.
  • Facial Pressure: Side sleeping might cause discomfort for those with sinus congestion or glaucoma and can exacerbate jaw stiffness.

Evaluating Other Sleep Positions

Ultimately, the best sleep position is one that feels most comfortable to you. However, understanding the impact of various positions can be helpful:

  • Back Sleeping:

    • Benefits: May alleviate hip pain, knee pain, arthritis, fibromyalgia, sinus congestion, and bursitis.
    • Tips: Use a pillow under your knees for lower back support, spread your limbs to reduce joint pressure, and choose a supportive pillow.
  • Stomach Sleeping:

    • Drawbacks: This position can strain the spine and cause back and neck discomfort. It’s often not recommended.
    • Tips: Use a flat pillow or none at all, avoid tucking your arms under your head, and alternate the sides of your head to prevent neck pain.

Sources

  1. “Side Sleeping: Which Side Is Best and How to Train Yourself to Do It.” CNET, Taylor Leamey, July 7, 2022
  2. “Could Body Posture During Sleep Affect How Your Brain Clears Waste?” Science Daily, August 4, 2015
  3. “How These 3 Sleep Positions Affect Your Gut Health.” Healthline, Jennifer Chesak, March 20, 2023

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