Little Bo Peep Can't Get to Sleep by Erin Dealey, illustrated by Hanako Wakiyama

From chapters.ca:
When Little Bo Peep can't get to sleep, her mother suggest counting sheep. But Peep can't count her sheep because she's lost them. Her brother, Little Boy Blue, who scared off the sheep in the first place, warns Peep she'll be in big trouble if she tells Mom and Dad. It's no wonder Peep can't catch a wink, even when Humpty Dumpty finds her flock. That tummy ache just won't go away until she tells her parents the truth about her missing sheep. From the same winning team who created Goldie Locks Has Chicken Pox, Little Bo Peep Can't Get to Sleep will strike a chord with every child who's ever had trouble fessing up!