Solomon
Ecclesiastes 5:12BSB·traditional attribution

The sleep of the worker is sweet, whether he eats little or much, but the abundance of the rich man permits him no sleep.

Matthew Henry Presbyterian @wholebiblehenry

Solomon had shown the vanity of pleasure, gaiety, and fine works, of honour, power, and royal dignity; and there is many a covetous worldling that will agree with him, and speak as slightly as he does of these things; but money, he thinks, is a substantial thing, and if he can but have enough of that he is happy.

Commenting on Ecclesiastes 5:9-17

John Gill Reformed Baptist @doctorgill

The sleep of a labouring man is sweet, whether he eat little or much,.... Or "of a servant" (i), who enjoys sleep equally as a king; a tiller of the ground, as Jarchi; who also interprets it of one that serves the Lord, as likewise the Targum; a beloved one of his, to whom he gives sleep, Psa 127:2.

Jamieson-Fausset-Brown Reformed @jfbcommentary

Another argument against anxiety to gain riches. "Sleep . . . sweet" answers to "quietness" (Ecc 4:6); "not suffer . . . sleep," to "vexation of spirit." Fears for his wealth, and an overloaded stomach without "laboring" (compare Ecc 4:5), will not suffer the rich oppressor to sleep.