We do "Now I lay me down to sleep, I pray the Lord me safe to keep, When in the morning, Lord, I wake, be with me then for Jesus sake. Amen."

As a child I also learned "Jesus tender Shepherd hear me, bless thy little lamb tonight, through the darkness be thou near me, keep me safe 'til morning light. All this day thy hand hath led me, and I thank thee for thy care, thou hast warmed me, clothed and fed me, listen to my evening prayer. Amen."

There's a version of Our Father by Christian singer Steve Green, sung by kids and set to music. It's pretty easy for kids to learn. Music always helps the memory.

All the best!