For me, a fairly wide range of mattresses are fine as long as they're not too thin or too soft, so I don't overthink it. However, my neck and shoulders are ext

For me, a fairly wide range of mattresses are fine as long as they're not too thin or too soft, so I don't overthink it. However, my neck and shoulders are extremely picky about pillows. Thin, flat and firm pillows make all the difference. If I stay in a hotel and see one of those "luxurious" 20cm thick fluffy monstrosities I'll throw it aside and use a rolled up towel instead.