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Obdormition (/ˌɒbdɔːrˈmɪʃən/; 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 colloquially referred to as the limb "going to sleep," and usually followed by paresthesia, colloquially called "pins and needles".