What would cause someone to wake up hot and sweaty?

United States
November 24, 2009 6:54am CST
I never have anything like this so I hope I am not getting sick. But I woke up twice last night hot and sweaty. First time I was having a nightmare the second time I was dreaming I was in the hospital with a 112 fever. What do you think could cause this? I hope Im not catching what my son had..