Psalm 4:8
I will both lay me down in peace, and sleep: for thou, LORD, only makest me dwell in safety.

what I like about the psalms is that they express feelings and attitudes of worship toward God; these early songwriters were not afraid to say exactly how they were feeling at the time. I sing psalms everyday to the Lord, because it makes the words come alive to me, and I have found that singing the words activate something in the atmosphere, especially if you make these songs apart of your everyday worship time with Him.

Also, something that I have learned by studying the word and listening to christian radio and tv shows, I have learned to greet Him in the morning with worship and praise, and also to praise Him and utter a prayer at night asking the Lord to protect me and to guide my dreams, asking for sweet dreams of revelation about His will for my life and about Him, and it has helped me a lot.

when you do the work of the Lord, satan, the enemy tries to attack you in your most vulnerable places, such as when you sleep at night, so I recommend that everyone ask the Lord for his protection when you sleep; it gives peaceful rest!