If you’re referring to the claim “If you always sleep on your right side, you…”, there isn’t good evidence that consistently sleeping on your right side is inherently harmful.
What it may affect:
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Heartburn/reflux: Right-side sleeping can worsen acid reflux in some people. Left-side sleeping often reduces reflux symptoms.
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Snoring and sleep apnea: Side sleeping in general can be preferable to sleeping flat on your back for some people with positional sleep apnea.
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Shoulder/hip discomfort: Staying on one side for long periods can put pressure on the shoulder, hip, or neck.
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Pregnancy: Sleep position recommendations can change during pregnancy, so pregnant people should follow their clinician’s advice.
For most healthy adults, comfort and sleep quality matter more than forcing yourself to sleep on one particular side. If you have persistent nighttime heartburn, loud snoring, pauses in breathing, or significant pain, it’s worth discussing with a healthcare professional.
