pitter patter of COLD feet!

If Daniel sleeps the whole night in his own bed (which is most of the time), he wakes up at the crack of dawn, or 6:30, whichever comes first. He comes and drags me out of bed with clamors for cereal and raisins and milk and his vitamin. (now mommy!)
But if he slips into our bed in the middle of the night and I don't wake enough to carry him back to his room, he just snuggles in between us, braces those cold little toes against the small of my back, and will sleep soundly until 8 a.m. What's up with that?
--Misty