I get the same thing sadly, way over hot at night, although these days I usually sleep through it fairly easily. Annoyingly enough, I'm about to destroy your statsistics a little bit though.
I have the same problem during the day as I do at night. I overheat very easily, am not a big fan of hot showers and my hands and feet are usually reasonably warm also.
I'm the kind of person who can go into the streets during winter wearing a t-shirt and unless it's snowing or the like not really feel cold.
This problem isn't As big as I have gotten older, but is still somewhat annoying, as the night time heating still happens on a constant level.
I've had this since I was small and have learned to live with it fairly well,it just means I warn people in advance when I sleep in the same bed as them. However it does seem to suggest that in my case it's not an illness.
However, a quick question to all of you guys. Can it hit suddenly? We think a friend of mine has a UTI and since that has started they've started getting overly hot at night and when they wake up they're getting ill with it,simply because it's too warm. Anything can be done to cool the body down before they wake up?