Obdormition (ən; 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`. ...
numbness in a limb caused by pressure on a nerve
• (n.) Sleep.
Numbness of an extremity, due to pressure on the sensory nerve. ... Origin: L. Ob-dormio, pp. -itus, to sleep ... (05 Mar 2000) ... 
Ob'dor·mi'tion noun [ Latin obdormire to fall asleep.] Sleep. [ Obsolete] Bp. Hall. 
obdormition 1. A falling asleep, or the condition of being asleep. 2. Numbness of a limb, etc. due to pressure on a nerve.