I have a memory foam / down alternative reversible pillow where the memory foam side has a cooling gel patch that stays cool (the down alternative side is the warmer side for winter, but I live in the southern US so it stays on gel all year). I got it off of Amazon apparently 3 years ago and they don’t sell that specific one anymore but I only paid $40 for it and it was an absolute game changer. If it does get warm all it takes is a rotation and BAM, cool on your cheek again.
The one I have is this one, but again they don’t have it in stock so maybe there’s a similar one somewhere.
ViscoSoft Hypoallergenic SeasonSense Standard Molded Memory Foam and Down Alternative Reversible Pillow with Cooling Gel and Removable Cover https://smile.amazon.com/dp/B00IZTKII2/ref=cm_sw_r_cp_api_i_v30fFbR5TTN48