metrical triplet form

I have read somewhere that Eph. 5:14 in Gk. is in "metrical triplet form."

Would someone care to comment on it's structure, and perhaps how the metrical
triplet is identified.  (Please pardon my ignorance.)
I am also curious as to the similiarity or lack thereof to 1 Tim. 3:16, and
the suggestion that one or both may have been at one time songs?

Kenneth Bent