Passage
If thou sleep, thou shalt not fear: thou shalt rest, and thy sleep shall be sweet.
If thou sleep, thou shalt not fear: thou shalt rest, and thy sleep shall be sweet.
Proverbs 3:22 And there shall be life to thy soul, and grace to thy mouth.
Proverbs 3:23 Then shalt thou walk confidently in thy way, and thy foot shall not stumble:
Proverbs 3:24 If thou sleep, thou shalt not fear: thou shalt rest, and thy sleep shall be sweet.
Proverbs 3:25 Be not afraid of sudden fear, nor of the power of the wicked falling upon thee.
Proverbs 3:26 For the Lord will be at thy side, and will keep thy foot that thou be not taken.
The verse centers on "thou", "sleep", "shalt", "fear", and "rest". It is saying that the verse draws attention to "thou" and "sleep", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 23's "Then shalt thou walk confidently in thy..." into verse 25's "Be not afraid of sudden fear nor...", so "thou" and "sleep" belong inside that flow. In Proverbs context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "thou" and "sleep" with trust shaped by these words, not by a vague optimism outside the passage.