I saw one advertised that is actually 4 or five small pillow “slices” that slide into a larger cover so you can actually sorta customize the height of your pillow. Want it smaller, just use a slice or two; thicker, use all 5. Seemed like a pretty neat idea.
Edit:It’s the pancake pillow and it’s unfortunately quite expensive!
This thing helps me most nights. I have a few pillows on my bed and switch between thinner and thicker depending on how my neck feels at the moment.
Pancake Pillow The Adjustable Layer Pillow. Custom Fit Your Perfect Pillow Height. Queen Size Luxury Pillow https://smile.amazon.com/dp/B00OM0YH6W/ref=cm_sw_r_cp_api_glc_fabc_yzdaGbNBYJM83?_encoding=UTF8&psc=1