I’ve got this problem and have had it for years. After my hand got injured it made things even worse. I spend a lot of hours a day in Autocad and in the shop.
The surgeons told me that when I sleep at night my hands drop down and this causes the blood flow to the hand slow down so i was waking up with a numb hand with a lot of hurt.
When I sleep at night or when it’s bothering me I wear a brace on my hand to keep it straight and on my arm right below the elbow I wear a tennis elbow or tendonitis brace.
Most nights this is the only way I can sleep all night long without waking up with a numb hand hurting so bad I have to get up.
-- Bruce http://plans.testsitem3.info http://www.sawmillgirls.com