When children have nightmares or are afraid of something at nighttime
Cheer up Ye saints of God, There's nothing to worry about. Nothing to make you feel afraid, Nothing to make you doubt. Remember Jesus never fails, So why not trust Him and shout. You'll be sorry you worried at all tomorrow morning!
This sing got me through many nightmares, at first my mom used to sing it to me when I woke up crying as a baby. Later on, I sang the song to myself until I fell asleep!