What Causes Excessive Sweating In A Child?

My son is 10 years old, very active with basketball and sports. For the last week, after his basketball practices or games, he has come home, eating a small meal, takes a shower and then goes to bed. A half hour after he is asleep he wakes up drenched in sweat, mainly on his head and scalp, but also on his bottom as well. Do you have any thoughts? He says he feels fine...