Have you considered a silk pillowcase?
Consider a silk pillowcase. It’s a big investment, but you may think about trying silk even if it’s just for the one pillowcase to sleep on.
Silk is «extremely breathable,» making it a good material for transitioning climates because it stays naturally «warmer during the winter and cooler in summer.»
Just remember that you always have to dry clean, since laundering silk in the washing machine will damage the fibers and ruin its softness.