David Rests in the Wadi at Sunriseby emmanuel_higgins

Psalms 13:3

Consider and hear me, O LORD my God: lighten mine eyes, lest I sleep the sleep of death;

In the verse sleep is used as a figure for death, with sleeping on into that sleep meaning to perish. The cry to be kept from that sleep carries a spiritual meaning, calling those sunk in insensibility and lethargy to be awakened and roused from their stupor. That awakening is a being made alert to God, lest unawakened insensibility end in perishing.

This call to be roused is pressed with special urgency because the coming of the Lord draws near.