I have trouble with the cold, and have to take extra precautions to avoid getting chilled. If I do get too cold it takes a long time to warm up.
But recently, I have been waking up at night freezing. It isn;t every night. No difference in the room temp. I have PLENTY of blankets on. The first time it happened I thought for sure the covers had slipped off, I was so cold. Last night I was actually shivering.
I will sometimes be like this if I have gotten chilled, even just by staying up later that usual, and forgetting that the heat has been set back. But in these cases, I am cold when I first go to bed, and take a long time to warm up.
But last night was the 3rd time this has happened recently, there was no reason for me to be chilled, I was plenty warm when I went to bed, yet shortly after falling asleep, I woke up freezing cold, and took 2-3 hours to finally warm up!