I have 6 king size pillows and 4 standard size pillows on my bed.
I sleep UNDER my pillows. I only use pillows while reading in bed.
Tip for pillow lovers: I recently purchased The best temper pedic filled pillows at Costco for $10/2 pack. Really supportive and mushy at the same time. I'm a pillow and linen snob, but can highly recommend these. Nice zipper liners too. They look expensive and feel luxurious.
I'm 26 and I sleep with one. Although occasionally if I am coming home late and it's already morning, I will put another pillow over my head to block out the light.
I have curtains in my room, but they aren't opaque.