Peripheral disturbances are the most common cause of paresthesias. "Falling asleep" occurs when the blood supply to a nerve is cut off--a condition called ischemia. Ischemia usually occurs when an artery is compressed.
numbness in the feet, ankles, and toes can be caused by poor circulation in the feet and not eating enough green vegetables.
Also, it is caused by Vitamin B12 deficiency or could be a pre-cursor to...