“A hangover is when you open your eyes in the morning and wish you hadn’t” is a jocular saying that has been included in many quotation collections that describe hangovers. “A hangover—that’s when you open your eyes in the morning, and wish you hadn’t” was cited in print in March 1957 and credited to Al Hibbler (1915-2001), an American baritone vocalist.
 
The saying is most often credited to Andy Capp (a British comic strip created by cartoonist Reg Smythe), but that comic strip began in August 1957—after Hibbler had already been credited for saying it.
 
 
Wikipedia: Al Hibbler
Albert George “Al” Hibbler (August 16, 1915 – April 24, 2001) was an American baritone vocalist, who sang with Duke Ellington’s orchestra before having several pop hits as a solo artist. Some of Hibbler’s singing is classified as rhythm and blues, but he is best classified as a bridge between R&B and traditional pop music. According to one authority, “Hibbler cannot be regarded as a jazz singer but as an exceptionally good interpreter of twentieth-century popular songs who happened to work with some of the best jazz musicians of the time.”
   
Wikipedia: Andy Capp
Andy Capp is a British comic strip created by cartoonist Reg Smythe (1917–1998), seen in The Daily Mirror and The Sunday Mirror newspapers since 5 August 1957. Originally a single-panel cartoon, Smyth later expanded it to four panels
 
2 March 1957, The Evening Standard (Uniontown, PA), Earl Wilson syndicated entertainment column, pg. 2, col. 5:
WISH I’D SAID THAT: “A hangover,” grumbles Al Hibbler, ”—that’s when you open your eyes in the morning, and wish you hadn’t.”
 
Google News Archive
6 September 1979, The Blade (Toledo, OH), Earl Wilson syndicated entertainment column, pg. P-7, col. 1:
“A hangover,” grumbled a lush,—“that’s when you open your eyes in the morning—and wish you hadn’t.”
 
Google Books
The Hangover Survival Guide
By Christopher Shultz and David Sloan
Key West, FL: Phantom Press
2006
Pg. 2:
“A hangover is when you open your eyes in the morning and wish that you hadn’t.” ~ Andy Capp
 
I Can Has Cheesburger?
A hangover
A hangover is when you open your eyes In the morning And wish you hadn’t
posted 5/3/2011
 
Zero Hedge
A Great Victory For Windmills
Submitted by Tyler Durden on 10/25/2012 09:14 -0400
Via Mark J. Grant, author of Out of the Box,
“A hangover is when you open your eyes in the morning and wish you hadn’t.”
-Andy Capp