Pillows are the band of my existence. I've got four on the bed, all different. I sleep on my belly when I'm stressed, on my back when I'm exhausted (hence the snoring, apparently) and on my side when I'm having a night that is as close to normal as I seem to be able to manage these days.
So, I fight the bloody things all night trying to get comfortable. I sweat so much some nights that even with a protective cover--and I will NOT consider plastic--I saturate them to the extent I have to chuck them out. Most don't wash well unless you have two identical ones so you can balance the spin cycle on your washing machine. Last time I tried to spin just one, the machine went off its dial, sounded like an elephant trying to get out of a shipping container, and wobbled ones of its feet off.
PS, never buy a wool pillow, I paid $60 for one thinking that it may live up to its 'cool in summer, warm in winter' marketing. No. By the time I'd had a good sweat on it, the bedroom smelled like a shearing shed. The pillow stunk of sheep. Horrible.