Over this winter I've realised that despite the fact that my feather and down duvets are insulating and stop you from sweating and all the nice things they do, I actually sleep better with a slightly heavier duvet - so on the nights it has been cold I've doubled up on duvets and slept like a log.
The only problem is that I run hot.
So... is there a duvet anyone can recommend that is a) relatively heavy and b) not too hot? I was looking at wool ones but don't know if they're going to be too warm.