He will not allow your foot to slip; your Protector will not slumber. Behold, the Protector of Israel will neither slumber nor sleep.
Maybe it's 2:47, and your mind has picked this moment to replay something you said last week, then move on to a bill, then to a worry about someone you love. You lie still and try to pray it away. When the thoughts keep coming, a second worry lands on top of the first: if I really trusted God, I'd be asleep by now.