Description 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. It's bedtime for Little Critter and Little Sister, but when there's 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 to be innocent in this nighttime adventure! Will they ever find out what's making the sound? Emergent readers will enjoy the humor and mystery in Little Critter: Night Night! Sleep Tight! Who better to help children navigate the challenges of learning to read than their friend Little Critter? There are many Little Critter I Can Read titles, but Night Night! Sleep Tight! is the second in the esteemed I Can Read Comics line (after Little Critter: Tricky Chickies ). These leveled comic books hook children on reading, give them the confidence to read on their own, and promote visual literacy.