One to sleep on but like 5 to 10 for the whole bed. You can't have to many nice clean pillows to chill on or melt into, that's one reason nice hotels are so awesome.
my wife and I have six. i sleep with two, Ms. Further with 1, but when awake reading, relaxing or whatever its three each.
I have two. Thanks for asking this vital question. Edit: My wife and I have three. I need two to elevate my head. I wear a C-PAP.
I think I need better pillows. got some of the memory foam ones, but i've been getting neck aches. I think the pillows are too high. I have 2 memory foam pillows, one on each side of the bed, then 3 standard pillows. they aren't the fluffiest though, I don't even remember where they came from tbh Wonder if my mattress can affect that too. who the fuck knows. It was comfortable in store. Not sure if I'm getting the best sleep lately.