This app helps toddlers, preschoolers and young children sleeping longer. This user friendly bedtime trainer gives your child a visual indication whether it is time to get up or to stay in bed. As long as the moon picture is lit, your kid knows it has to sleep a while longer. In the morning, at a time chosen by mom and dad, the moon switches to a picture of the sun: it's okay to get up! Result: a better night's sleep for the little one and, equally important, his/her parents. The app is…