Night sweats first trimester?

I've had a look online and some siurces say it's normal to have night sweats during the first trimester, others say not until the second or third. I'm having difficultiessleeping at the moment, which I know is a first trimester thing. I woke up about 15 times last night and it seemed that every time I woke up, I was either super hot (sweating through my pyjamas hot), or freezing cold. Have others experienced this? Is this normal?