Oh C bad luck - the freezing night wouldn't have helped with that. Discombobulates the system. Hope tonight is a bit better, throw on an extra duvet.
Have you tried flinging the windows open an hour before bed and whacking the elec blanket up to nuclear simultaneously. This is expensive but you get fresh air, cold head and cold pillow (narcotic) and hot body (ditto).
Pillowcases from the fridge work too.
Bet PB came on to check up on you - :)
Have you seen the 'or did we get sold defective cats' thread - it's new. Even I know the answer; OP bought a pair of Siamese. Don't tell her too much, she's already very concerned :)