Well, it's a play on words.
5 seconds sound clip from the Christmas in July (1944) classic radio play.
You can hear this line at 00:16:15 in the radio play.
Quote context
[...]
- And, in my opinion, that's ample reason for this demonstration.
- Thanks.
- Now, I suppose I'll have to hire you back at a fat increase.
- Well, I've always liked it here, but a little raise would come in handy.
- And you really won the contest, eh?
- 'If you don't sleep at night, it isn't the coffee, it's the bunk.'
- But coffee keeps you awake! I know!
- Yeah, but don't you see, this Viennese scientist he says...
[...]