I am so sorry about your hamsters death.
Teddy died like that and I thought the same thing: he was sleeping, but sadly, he wasn't. It broke my heart when I went to pick him up and he was stiff and didn't make a move.
I know how you feel. Peedee was a very special hammy to you. He is at the Rainbow Bridge right now and he is playing very hard.
Say "hello" to Teddy for me Peedee. Good luck at the Rainbow Bridge and play hard, sweetie