“Your guardian will not slumber.” (121:3)
Think about parents who just brought home a tiny infant, helpless and demanding. Mom and Dad are understandably reluctant to leave this new member of their household unsupervised, even while the baby is sleeping. So no matter where they are in the house, there is a monitor, video or audio, connecting them to baby. When they themselves go to sleep, the lightest baby peep, the softest cry, is enough to wake them. And in fact often the lack of sounds, the thought that they can’t hear the baby breathing, is enough to rouse them in a panic. Such is the protective nature of love.