A Beatles, song, movie, and album (actually a soundtrack for the film) All three of them are absolute classics. The phrase 'a hard day's night' was actually created accidentaly by Ringo Starr, who often combined two phrases to create a new one.

A) the Beatles' first movie that hit the big screens in 1964. Has the same name as the album also released that year.

B) one of Ringo Starr's many idiosyncrasies

C) a cooler way of saying "I've had a tough day."

The essence and summary of having lived the 'day' of ones life in 'darkness'. It has been... denotes a looking back or hindsight and the choise of the word 'hard' implies difficulty. Generally such epiphany comes sadly late.

Last minute, enlightenment is frequently found where mill stones were considdered mile stones.

3rd album by The Beatles, released in 1964.

--TRACKS--
-SIDE 1-
A Hard Day's Night
I Should Have Known Better
If I Fell
I'm Happy Just To Dance With You
And I Love Her
Tell Me Why
Can't Buy Me Love
-SIDE 2-
Any Time At All
I'll Cry Instead
Things We Said Today
When I Get Home
You Can't Do That
I'll Be Back

A Hard Day's Night is the 1st Beatles' Movie too, released in the same year of the album.