אִם־שָׁכַ֗בְתִּי וְאָמַ֗רְתִּי מָתַ֣י אָ֭קוּם וּמִדַּד־עָ֑רֶב וְשָׂבַ֖עְתִּי נְדֻדִ֣ים עֲדֵי־נָֽשֶׁף׃
When I lie down, I say: ‘When shall I arise?’ But the night is long, and I am full of tossings to and fro unto the dawning of the day.
Read midrashic interpretation of Job 7:4: and classical rabbinic exegesis.