You may want to make this (Martin Luther's Evening Prayer) your prayer too:
http://storage.cloversites.com/trinitylutheranchurch7/documents/MARTIN%20LUTHER%20Prayers.pdf
I thank you, my heavenly Father, through Jesus Christ, Your dear Son, that You have graciously kept me this day; and I pray that You would forgive me all my sins where I have done wrong, and graciously keep me this night. For into Your hands, I commend myself, my body and soul, and all things. Let Your holy angel be with me, that the evil foe may have no power over me. Amen