I radiate heat when I wake up in the mornings.
Pulsating, haze-wavy heat.
In fact, I could quite possibly melt your hypothetical ice-encased body (resulting from your hypothetical misguided time machine excursion into the Pleistocene Ice Age followed by the fortuitous hypothetical Star Trekian beam thrusting you back into the present and materializing you straight into my bed) with approximately 15.3 seconds of indirect contact.
During most given days, I feel as if I'm running about 10 degrees colder than any actual environment I'm in. I shiver. I chatter. I say things like "no, seriously, feel my nose!", which my husband becomes increasingly annoyed with in direct proportion to the rate at which I seem to believe that HE NEEDS TO FEEL HOW COLD I AM RIGHT NOW! I stash sweaters in every room at easy arm's reach. I've even sunk so low as to resort to using the ever-avoided vacuum to remind my blood to extend itself to the very ends of my body, or OH YEAH there's always working out to get things thawed out. (And yes, I would actually rather do a cringeworthy workout than vacuum.)
...and yet.
The Husband believes he could possibly cook eggs on my body for breakfast while I'm sleeping.
I have a theory that I am hibernating like a bear every night.
However if this is true, shouldn't that mean I'd be burning a hell of a lot of fat in bed? Hmm...Sleep As Toning Technique...I could get behind that movement, if only it appeared to be a working practice.
Someone get on that.