(Psalms 4:8) I will both lie down in peace, and sleep; For You alone, O LORD, make me dwell in safety.I think God built night into the world and built the need for sleep into our human bodies so that we could see our helplessness and be humbled before Him.
(Psalms 127:2) It is vain for you to rise up early, To sit up late, To eat the bread of sorrows; For so He gives His beloved sleep.
Sleep is a lesson in trust. You cannot protect yourself while you are asleep. You cannot run from danger or fight an attacker. You are blissfully asleep and essentially helpless. To do anything in your own behalf you need to wake up.
Because we need to sleep, we see our limitations. We cannot concentrate on anything for an indefinite period of time. We become fatigued. Our mind begins to falter. We can only continue after we recover through sleep. God is infinite. God is omnipotent. His knowledge of everything is exhaustive. His concentration never flags. We need to trust in Him. We can trust in Him.
(Psalms 121:2-7) My help comes from the LORD, Who made heaven and earth.
3 He will not allow your foot to be moved; He who keeps you will not slumber.
4 Behold, He who keeps Israel Shall neither slumber nor sleep.
5 The LORD is your keeper; The LORD is your shade at your right hand.
6 The sun shall not strike you by day, Nor the moon by night.
7 The LORD shall preserve you from all evil; He shall preserve your soul