Hiya, my 3 year old DS fell asleep early tonight, we checked on him until about 8.30, all fine, checked again about 10.30 he was red hot (and had weed right through his pull up)
He is now stripped into a t shirt, pull up and thin blanket (will not settle without one), having sips of juice, has had calpol and is being lovely, clearly tired, but happy to be on his bed with me sat at his side. Would you call a Dr or see how he goes? There are no other symptoms, rash pains or anything 
Wouldn't normally ask but it is a very high temp.