Always the hand which gets the most numb. Because when i get home and have a Jodrell Bank it feels as if somebody else is doing it 
brilliant!!!!
Not really, numb hands can indicate Carpel Tunnel Syndrome. It's not a nice operation to have to get this fixed; if you can get it fixed.
I must admit I do wake up with a numb arm but I think that's just the way I sleep...you've got me all worried now Tosh!