If you sleep straight without pillow it may be ok but if you sleep on right or left side than pillow helps the muscles or not.

Dr. Karuna ChawlaHomeopath23yrs exp

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Yes, you need pillow.  

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Dr. Shweta BadghareHomeopath16yrs exp

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Good posture is important while sleeping choose a mattress that provide support for natural curves for your spine muscle and ligament of your back relax heal themselves while you sleep ,small pillow under knees will reduce stress on your spine ,pillow under head support neck and shoulder ,placing flat pillow under stomach and proves area can help to keep the spine in better alignment ,if you sleep on side pillow between knee will prevent your upper from pulling your spine out of alignment and reduce stress on hips and lower back , pull knee straight up toward chest , insert pillow into gaps between body and mattress.  

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