Jeremiah 31:26 Kabbalah

עַל־זֹ֖את הֱקִיצֹ֣תִי וָאֶרְאֶ֑ה וּשְׁנָתִ֖י עָ֥רְבָה לִּֽי׃ (ס)

Upon this I awaked, and beheld; And my sleep was sweet unto me.

Read kabbalistic (mystical) interpretation of Jeremiah 31:26: and classical mystical sources.