I also have. A u shape and it is the only thing that brings me some relief. If my partner gets too close then I do get hot but that’s the pregnancy and him being like a radiator more than anything. If you are finding it too hot, take your duvet out and only use the cover .
love my bbhugme it’s soft and can bend at any shape u like or tighten for different hardness. It’s not set in a certain shape. Also I think the insides are like beanbag materials so I’ve never felt hot against it.
I use a u shape one but I sleep with the connected bit by my head with a pillow and tuck the side in between my legs and against my back, has been pretty comfortable so far