How do I choose between different mattress types?

Most mattresses last around 7-10 years before they start breaking down, so you're right on schedule with that 8-year replacement. For someone who sleeps hot and moves around a lot, memory foam is probably going to work against you because it traps heat and can feel restrictive when you're shifting positions. I switched from memory foam to a hybrid about two years ago and the difference was huge - the coil support layer lets me move freely without that sinking-in feeling, and it doesn't hold onto body heat the way foam does.

Spring mattresses are your most breathable option if cooling is your priority, though they can sometimes feel a bit bouncy if you're used to modern comfort. Hybrids split the difference with coils for airflow and support plus a thinner comfort layer on top, which is why I'd lean that direction for your situation. When you're shopping, actually lie on them for a few minutes if you can - don't just do a quick test. I made the mistake of spending 30 seconds on my last mattress choice and regretted it for years. Pay attention to how much the mattress hugs you versus how much it lets you move freely, and whether you feel any heat building up.

One thing I didn't realize until I started getting better sleep was how much the foundation matters too. If your current bed frame is old, upgrading that alongside the mattress can make a real difference. Also, consider your budget range first because that'll narrow things down quickly - luxury brands aren't always worth the premium if a mid-range hybrid gives you the same cooling and support. Give yourself permission to try it out and return it if the first week doesn't feel right; most retailers have decent return windows now.