Proverbs 3:24 When thou liest the down, thou shalt not be afraid: yea, thou shalt lie down, and thy sleep shall be sweet.
A further promise on condition of keeping sound wisdom and discretion is that you shall not be afraid when you lie down to sleep, and your sleep shall be sweet. If we receive and keep the Word and Wisdom of God we can trust the Lord to keep us unafraid when we are vulnerable. We may be vigilant, but sometimes we still need rest and sleep. We must be able to trust the Lord to keep us unafraid at all times. God gives His sweet sleep and allows us to rest in safety and comfort.
Sound wisdom and discretion comes from hearing the word of Christ. We keep that word of promise and ponder it in our hearts. Then we go about our daily and nightly lives trusting Him to keep us unafraid.
Fears and anxieties give many people sleepless nights, but we have the promise that the sound wisdom and discretion of Christ can remove the anxieties and allow peaceful sleep.