I keep having extreme changes in my temperature (not as in 101 degrees). One minute, I am extremely hot. A few minutes later, I am freezing. I am not the cold type, so putting on socks and wrapping up in a blanket is not normal for me. I have hypothyroidism, and I had my thyroid levels checked last Friday. According to the nurse, my levels are within the normal range. My doctor didn t seem overly concerned, but this is affecting my sleep cycle. I wake up often during the night--my hair moist with sweat or covered in chill bumps. Is there another test I need to consider?