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Numbness in one arm or leg can be from sleeping position, or from pressure on a nerve as it transverses a narrow area, such as a cubital tunnel, but if you are noticing it in all limbs, you need to see your primary provider. Simple blood work may reveal a vitamin deficiency, or you may need a referral to a neurologist. There are dozens of causes of numbness and no way to tell without testing what is causing it.