Just recently I´ve started getting really hot in bed at night too. Normally I´ve always been very cold and always went to bed with PJ´s and bed socks on etc....the socks would usually come off middle of the night or not at all. Recently though I´ve been kicking my socks off almost straight away and the cover keeps being thrown off all the time. Yet right at the beginning of my pregnancy, I was freezing cold all the time!! I suppose it all the extra blood circulating round our bodies at the moment.
I´ve got no cures for it though, I just keep sticking my feet out of the covers at night to cool me down!