This verse sits inside the father's lecture on wisdom and the neighbor, Proverbs 3:21–35.
Quick answer
Wisdom's security follows you to bed: the person whose life is ordered by sound wisdom lies down without dread, because the day behind them holds no ambushes waiting to spring.
Read the whole unit
The father's lecture on wisdom and the neighbor moves in three sweeps. First, security (vv. 21–26): keep sound wisdom in view and the results are bodily and immediate, safe steps, unafraid nights, sweet sleep, because "the LORD will be your confidence." Second, the neighbor (vv. 27–31): five consecutive "do nots" that bring wisdom down from the cosmos of the preceding poem to the person next door. Do not withhold good that is owed, do not delay it until tomorrow, do not plot against the neighbor who trusts you, do not pick fights, and do not envy the violent man who seems to be winning. Third, the reasons (vv. 32–35): four verses that ground neighbor-ethics in the LORD's own stances, His abomination and His intimacy, His curse and His blessing, His scorn and His grace, and the divergent inheritances of the wise and the foolish. Some scholars divide the passage at v. 27, treating the neighbor commands as their own unit; the flow of thought holds together as one lecture, since the "do nots" rest directly on the security just described (a person confident in the LORD can afford to be generous and unenvious) and the closing verses supply the reasons for both halves. This entry set treats 3:21–35 as one lecture and notes the boundary question honestly here, once.
What this verse contributes
Night is when the mind empties its pockets: debts, deceptions, quarrels, risks taken against better judgment all come out for review at two in the morning. Sweet sleep is downstream of an ordered life, and the verse describes tendency, not a sedative guarantee; it is no rebuke to the anxious, for grief and worry visit wise people too. Psalms 3 and 4 show the same rest held even in danger, because its ground was never circumstances but the LORD.
Related: Psalm 4:8 · Psalm 127:2
New King James Version®, Copyright © 1982, Thomas Nelson. All rights reserved. Full copyright information. Scripture provided by API.Bible.
Go Deeper
If this verse has been used to put weight on you that it was never carrying, ask about it directly.