Bolster pillow made of foam or cotton used during sleep, in order to be comfortable when we sleep like a hug something. Bolsters have an oval shape like a cake or many say resembles a ghost "pocong".
But from some people if they want to sleep there must be rolling in the hug, if there is no rolling it into a less comfortable bed and sleep becomes restful.
I too have bolsters to sleep and I gave the name "luvly". I would feel if I slept soundly embraces not rolling. when I went I was rolling it will take.I think it bolsters a special section to be able to sleep more comfortably and soundly