מְתוּקָה֙ שְׁנַ֣ת הָעֹבֵ֔ד אִם־מְעַ֥ט וְאִם־הַרְבֵּ֖ה יֹאכֵ֑ל וְהַשָּׂבָע֙ לֶֽעָשִׁ֔יר אֵינֶ֛נּוּ מַנִּ֥יחַֽ ל֖וֹ לִישֽׁוֹן׃
Sweet is the sleep of a labouring man, whether he eat little or much; but the satiety of the rich will not suffer him to sleep.
Read kabbalistic (mystical) interpretation of Ecclesiastes 5:11: and classical mystical sources.