This cold thing really is strange. I woke up this morning and I wasn't cold. I was hot and sweaty. I had to take the covers off. As the day went on I have gotten colder and colder. Of course a factor in this could be that this morning it was +2C outside and now it is -25C with a -40C wind chill which does increase the draftiness of my apartment but I don't think that is the sole reason. Thinking back, I don't think this is the first time I have experienced this. I am going to keep track of how I feel over the next few days but do others here experience being hot in the morning and cold at night? atlee's explanation about drinking cold water could explain this as I do drink a lot of water and it is generally very cold. Maybe I'll try drinking some warm water over the next day or two and put this theory to the test.