Cold =brain fog

Does anyone else find when they cold or environment is cold you suffer like brain fog I been getting this lot this winter just cannot think or function feel miserable. Been keeping fire going to keep house warm for morning or like today fire gone out , cold fell asleep in chair woke up from sun warming me up and then sat in sun for about half hr and now feel functional. I have only just learnt that I am not depressed or lazy when I have trouble completing tasks So just wondering if another ADHD thing