Little Critter: Night Night! Sleep Tight!By: Mercer Mayer Illustrator: Mercer Mayer Series: I Can Read Comics Level 1 When beloved character Little Critter hears something going tap tap in the night, he is determined to find the source, in this Level One I Can Read Comic by Mercer Mayer. Its bedtime for Little Critter and Little Sister, but when theres a strange sound in the night, the two are determined to find the source of the tap tap. Things that look like monsters in the dark turn out