Ecclesiastes 4:8 describes endless toil with no one to share it, echoing the vexation and vanity of the laborer in Ecclesiastes 2:23.

Ecclesiastes 3:9 questions the gain from toil, while 2:23 answers that it is pain and vanity, reinforcing the same futility.

Ecclesiastes 1:2 declares all is vanity, the thematic framework for the 'this also is vanity' conclusion in Ecclesiastes 2:23.

In Ecclesiastes 8:16, the same sleeplessness from labor is described — 'neither day nor night do one's eyes see sleep' — echoing the restless nights.

Ecclesiastes 5:12 notes the laborer sleeps sweetly — contrasts the sleeplessness of the restless toiler here.

Ecclesiastes 7:15 adds another example of life's vanity — the injustice of righteous suffering — expanding on the theme of futility.

Ecclesiastes 6:9 echoes the vanity theme — better to enjoy what you have than chase desires, contrasting with the sorrow of toil.

Psalm 90:7-10 describes life as toil and trouble under God's anger — same portrayal of fleeting, sorrowful days.

Psalm 127:2 calls anxious toil vain and says God gives sleep to His beloved — directly contrasts the restless nights here.

Psalm 77:2-4 vividly portrays a sleepless night of trouble and refusal to be comforted, directly mirroring the restless heart in Ecclesiastes.

Psalm 6:6 weeps all night flooding the bed — parallels the sorrow and restless nights of constant toil.

Job 14:1 says man is 'full of trouble' — identical theme of life's inherent suffering and brevity.

Job 7:14 says God terrifies him with dreams — a specific cause for the restless nights described here.

Job 5:7 states 'man is born to trouble' — directly parallels the universal sorrow and toil described here.

Genesis 3:17 is the curse of painful labor from the Fall, which grounds the toil and vexation described in Ecclesiastes.

Matthew 11:28 offers rest to the weary — in direct contrast to the relentless sorrow and sleeplessness described here.

Psalm 90:15 acknowledges affliction but prays for gladness — contrasts the unrelieved sorrow here with hope for joy.

Daniel 6:18 recounts the king's sleepless night from anxiety over Daniel, a different cause but the same restlessness as Ecclesiastes.

Psalm 32:4 depicts God's heavy hand causing dryness and burden, similar to the oppressive toil and vexation in Ecclesiastes.

Job 7:13 expresses hope that bed will comfort, but his rest fails — echoes the theme of unfulfilled rest at night.

In Genesis 47:9, Jacob describes his years as few and evil, echoing the Preacher's statement that all days are sorrow and grief under the sun.