I had my hamster for 55 days. He was young, active, eating and drinking well, every thing was fine except that he was sneezing. One day, I checked on him at 11am and he was sleeping, at nearly 12 I went to the room where he was still sleeping, after a while I heard him screaming, at first I didn't know what was that noise and ignored it. But a few hours later when I went again to check on him, he was in his corner dead. What could possibly be the reason for his death?!!