It’s a common issue with memory foam, and especially closed cell foam. Some of the foam mattresses on the market now use a gel or gel-infused layer to take adva

It’s a common issue with memory foam, and especially closed cell foam. Some of the foam mattresses on the market now use a gel or gel-infused layer to take advantage of phase shifts, while others use a cooling layer with air channels above the memory foam. I switched from a memory foam mattress to the Purple specifically because of the heat issue.