שָׁ֤וְא לָכֶ֨ם ׀ מַשְׁכִּ֪ימֵי ק֡וּם מְאַֽחֲרֵי־שֶׁ֗בֶת אֹ֭כְלֵי לֶ֣חֶם הָעֲצָבִ֑ים כֵּ֤ן יִתֵּ֖ן לִֽידִיד֣וֹ שֵׁנָֽא׃
It is vain for you that ye rise early, and sit up late, Ye that eat the bread of toil; So He giveth unto His beloved in sleep.
Read Jewish philosophical commentary on Psalms 127:2: and classical philosophical sources.