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Obdormition (/ˌɒbdɔrˈmɪʃən/; from Latin obdormire "to fall asleep") is a medical term describing numbness in a limb, often caused by constant pressure on nerves or lack of movement. This is also referred to as a limb "going to sleep," usually followed by paresthesia, colloquially called "pins and needles".[1]