שיר השירים ה:ב פירוש: רש״י וEzra ben Solomon

I slept. When I was confident and calm in the first Beis Hamikdosh, I despaired of worshiping the Holy One, Blessed Is He, as one who slumbers and falls fast asleep.

I was asleep: The shekhinah states, I was asleep in Babylonian exile.

But my heart was awake. This is the Holy One, Blessed Is He. This is expounded in the Pesikta.⁹Alternatively, ולבי ער, refers to the prophets and the sages who were constantly exhorting and rousing the Bnei Yisroel to rise from their spiritual sluggishness. (Sforno)