Upon this I awaked, and beheld; and my sleep was sweet unto me.
Upon this I awaked - the words of Jeremiah, Upon this (or, By reason of this) announcement of a happy restoration, I awaked from the prophetic dream vouchsafed to me (Jeremiah 23:25), with the sweet impression thereof remaining on my mind.
My sleep was sweet unto me - "sleep" here means dream, as in Psalms 90:5