Pillow SpongeBob is a character who appears in the episode "Rise and Shine."
Pillow SpongeBob is a white pillow with SpongeBob's face drawn on it by Patrick, who also put his underwear on the pillow.
After destroying an annoying alarm clock, Patrick still hears ringing and is eager to know where it's coming from. As a result, he creates a pillow version of SpongeBob and demands an answer. Due to being an inanimate object, the pillow does not respond, much to Patrick's disappointment.
Shortly after, Patrick's alarm clock interrupts it under the pillow and reminds him that it's time for breakfast.