Wake up covered in sweat every night no matter what the temperature in the room is. i don't remember having this before i had my baby. i'm 9 months post partum and breast feeding. should i be concerned?

This sounds like you're having true night sweats. It's often a sign of fever that breaks during the night. Chronic infections like tuberculosis is possible, along with other potentially serious conditions. This is something to discuss with your doctor. You also could take your temperature 3-4 times a day and write down he results, which will help your doctor evaluate the situation. Good luck.