I know this will sound a bit weird but since having my DS (now a year old) I'm always cold. I used to always be warm, my DH said I was like a radiator in bed and that we never needed a hot water bottle when I'm around. Now it's me trying to warm up off him and he says I'm like a fridge. I never used to be able to wear PJ's or I'd wake up sweating, now I'm always cold in bed and don't find our duvet heavy enough at all.
It's so weird but doesn't feel like something worth bothering a Dr about, is it ??