Following is Psalm 3, from the New Living Translation.

1 O Lord, I have so many enemies;
so many are against me.
2 So many are saying,
“God will never rescue him!”

3 But you, O Lord, are a shield around me;
you are my glory, the one who holds my head high.
4 I cried out to the Lord,
and he answered me from his holy mountain.

5 I lay down and slept,
yet I woke up in safety,
for the Lord was watching over me.
6 I am not afraid of ten thousand enemies
who surround me on every side.

7 Arise, O Lord!
Rescue me, my God!
Slap all my enemies in the face!
Shatter the teeth of the wicked!

8 Victory comes from you, O Lord.
May you bless your people.

King David wrote this as he was running from his son Absalom who had put together a whole army set on overthrowing David and making Absalom the king. How often do I really think of God as a shield around me? Or do I instead see myself as having to provide my own protection? When I have the worry of ten thousand enemies surrounding me, can I even go to sleep? My problems of this world seem minimal in comparison to what David was facing. God is here to guide me and protect me though. My shelter must be in Him. I will try to sleep soundly tonight, at peace behind God's shield.