Psalm 6

Turn, Lord, and deliver me.  Save me because of your unfailing love.

Psalm 5

Hear my cry for help, my King and my God, for to you I pray.

Psalm 4

This one feels a lot like Psalm 3.  Starting out with "Answer me Lord when I cry out to you", or something like that, and concluding with something to the effect of "Because God is in control, I can sleep soundly despite all the craziness happening all around me."

We see the theme of trust, and the Lord watching out for the righteous while filling our hearts with joy.