The kidneys are located toward the back of the upper abdomen, one on each side of the spine.

Because the right kidney is positioned slightly differently from the left, some online articles claim that sleeping on one side "detoxes" or "cleans" a particular kidney.

These claims are not a reliable basis for changing your sleeping position.

Your kidneys don't need a special sleeping position to perform their normal filtering functions.

They work continuously regardless of whether you're lying on your left, right, back, or stomach.

If you have kidney disease, kidney stones, or another urinary condition, your doctor may give you specific advice based on your symptoms.

But healthy kidneys don't require a particular side of the bed to function properly.

17. Right-Side Sleeping During Pregnancy

Pregnancy deserves its own discussion.

As pregnancy progresses, sleeping on the side is generally encouraged because prolonged flat-back positioning later in pregnancy can place pressure on major blood vessels.

The left side has historically received special attention because of its relationship to blood flow.

But pregnant people should not become frightened if they naturally roll onto their right side.

Modern guidance generally supports comfortable side sleeping rather than demanding that someone remain exclusively on the left.

If you're pregnant and your right side is more comfortable, it's reasonable to use it.

The more important consideration is avoiding prolonged uncomfortable flat-back sleeping later in pregnancy and following individualized advice from your prenatal care provider.

18. Right-Side Sleeping May Be Helpful If Your Left Shoulder Hurts

There's a simple practical advantage to changing sides when one shoulder is painful.

If your left shoulder hurts, sleeping on your right side can keep pressure away from the injured area.

The same principle works in reverse.

If your right shoulder is painful, sleeping on the left may be more comfortable.

You don't need to interpret this as a complicated medical rule.

Sometimes the best sleeping position is simply the one that doesn't hurt.

19. Don't Stay on One Side Just Because You Think You Have To

People often assume they need to choose one position and stay there all night.

You don't.

Movement during sleep is normal.

Your brain and body continuously adjust your position in response to pressure, temperature, discomfort, and other signals.