There are 5 in my bed - but I only use 1.
One. Though at one point this year I had like six. It was ridiculous. I didn't know what the heck to do with them all.
At least 2 and sometimes as many as 4.... though all too often 3 of them pillows do feel like the use me more as a pillow that I use them as a pillow. Them dang demanding doggies.
I sleep on 2