Copied from http://www.jimbowieband.com/Lyrics/goodnight_sweetheart.htm

GOODNIGHT, SWEETHEART, GOODNIGHT
(Calvin Carter and James "Pookie" Hudson)

Goodnight, sweetheart. Well, it's time to go.
Goodnight, sweetheart. Well, it's time to go.
I hate to leave you but I really must say,
Goodnight, sweetheart, goodnight.

Goodnight, sweetheart. Well, it's time to go.
Goodnight, sweetheart. Well, it's time to go.
I hate to leave you but I really must say,
Goodnight, sweetheart, goodnight.

Well, it's three o'clock in the morning.
Baby, I just can't sleep tonight. [or "treat you right"?, or "can't get right", or "you won't treat me right"?]
Well, I hate to leave you, baby, don't mean maybe,
Because I love you so.

Goodnight, sweetheart. Well, it's time to go.
Goodnight, sweetheart. Well, it's time to go.
I hate to leave you but I really must say,
Oh, goodnight, sweetheart, goodnight.

Mother, and your father
Don't like it if I stay here too long.
One kiss in the dark and I'll be going.
You know I hate to go.

Goodnight, sweetheart. Well, it's time to go.
Goodnight, sweetheart. Well, it's time to go.
I hate to leave you but I really must say,
Oh goodnight sweetheart, goodnight.

[Originally performed by the 5 piece doo-wop group The Spaniels. Written in 1954, it was a #5 R&B hit. Written by Calvin Carter and James (Pookie) Hudson (lead singer for The Spaniels). Re-released by The McGuire Sisters. Popularized in the 1970s by the group Sha Na Na, who used it to close their TV show each week.]