Pillows. I'm most opinionated about pillows, I have been my entire life. If I had to save a single thing from my bed setup, from a fire, it would be my pillow -- https://hullopillow.com

It's very cool. I hate pillows that make or keep my head warm. The buckwheat hulls are very sparse, not at all insulative, so they don't keep my head warm.

The pillow is infinitely-malleable, so it's very easy to reach a comfortable position. I'm tall with broad shoulders, so sleeping on my side is hard. Most pillows are too thin. The buckwheat pillow is easy to pile up under my head when I lie on my side.

Previously I'd used a contour memory foam pillow, like this -- https://www.contourliving.com/contour-pedic-memory-foam-pill... I got many years from that. But it's warm, and still not tall enough to sleep on my side, and it's very hard to clean.

Get a buckwheat hull pillow, a good one. That's my advice.