lol sorry I dont mean to laugh, but my baby did the same thing! Well, not *my* pillow but my husbands..
She then told us that she coudlnt do it during the night and we had her sleep in her playpen/crate, and she still does. She goes to sleep with us, but we get up now around 3-4 Am to put her in her playpen next to the bed just to avoid it since we don't 100% trust her yet..lol.