Hi micmse,
It would be helpful if you can provide a little more information including how long you’ve had your mattress, which mattress you purchased, the type of foundation you have under your mattress, your body type and weight and sleeping positions, and whether you believe your discomfort or symptoms are from the mattress being too firm or too soft.
Having said that there are some general suggestions in post #2 here that may be helpful.
There could be many reasons for this but there is more information in post #2 here and the posts it links to that may help you track down why you are sleeping warmer than you would prefer.
There could be several reasons for this as well (outside of any differences in what is under or over your mattress).
Outside of actually having a layer that is firmer or softer on one side than it was meant to be … one possibility is that the layers on each side are arranged differently (the bottom two layers are layered in a different order).
Another possibility is in the Dunlop layers. Dunlop can have some slight differences in the firmness betwen the top and bottom of the layer and there is also a natural range of firmness levels with Dunlop as well so a layer that is cut from the top of a 6" core can be softer than the layer that is cut from the bottom of the core (see post #6 here) and some people may be more sensitive to smaller variations in firmness than others. It may help to switch sides with each layer to isolate which layer seems to be the cause of any difference between the sides and then you could try flipping that layer or using it in the side to side configuration which is best for each of you.
It could also be from weight differences and the speed that each side of the mattress is breaking in.
The same foam can feel softer for higher body weights as well but I’m assuming that both of you are feeling the same thing when you try each side of the mattress.
While SleepEZ would be the best source of guidance because they know more about their mattresses than anyone else and a phone conversation can help “talk you through” any issues and cover much more ground than forum posts, if you can provide some additional information I’d also be happy to make any additional suggestions that I can.
Phoenix