Orthopaedic surgeon Joseph Schreiber, of the Raleigh Orthopaedic Clinic in Raleigh, North Carolina, explained that numbness in your hands can be your body's way of informing you that something isn't quite right, and if the problem persists, Schreiber recommends booking an appointment with a doctor (via Well and Good). "If people ignore this for a long time, they can start to develop other problems such as weakness or more permanent numbness and tingling," he explained.
Elsewhere, other more serious causes of hand numbness in your sleep include syphilis, lupus, certain forms of arthritis, encephalitis, and tumors (via Medical News Today).
Per Healthline, there are ways to help prevent more common and less-serious causes of hand numbness during sleep, including keeping your arms by your side at night, avoiding sleeping in the fetal position, and ensuring your arms are not positioned under your pillow or body while you sleep, as this can put significant pressure on the nerves in your hands.
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