When an older sibling plays too close for comfort to the sleeping baby a cautionary voice calls out 'Shhhhh, Lilly-Lu, don't wake Baby!'. But Lilly-Lu pays scant attention and carries on jumping and skipping and singing and dancing all far too close. When finally the exhausted Lilly-Lu gives up and goes to sleep. But guess who wakes up? A lovely reassuring picture book about the desire to cause just a little bit of trouble - and the normally unpredictable sleeping patterns of little sisters and brothers.