Numb hands on waking are not always due to sleeping in the wrong position. Sometimes this is a reflection of a deeper issue. Sleeping on top of a limb constricts nerves but other causes of nerve damage include alcohol use and abuse, diabetic issues, medication and even food poisoning. Insect bites can cause tingling and it’s a symptom of carpel tunnel syndrome as well. If you wake with numb hands review the potential causes and make sure it’s not a serious cause.