That headline is incomplete and sounds like clickbait. Sleeping on your right side isn’t generally harmful, and there isn’t a universal item everyone who sleeps on that side “should have.”
The main evidence-based considerations are:
Acid reflux: Left-side sleeping can reduce nighttime reflux for some people; right-side sleeping may make it worse.
Shoulder/hip discomfort: A pillow between your knees or one that supports your head and neck may improve comfort.
Snoring or sleep apnea: Side sleeping can be preferable to sleeping on your back for some people.
Pregnancy: Side sleeping is commonly recommended later in pregnancy, but individual advice should come from a healthcare professional.
If you send me the rest of the headline after “you should have…” or a screenshot of the post, I can tell you exactly what it is claiming and whether it’s medically accurate.
