This is a saying used for someone who doesn't know what they are talking about. When someones is "up in the night", they may be confused, or making up facts, or just simply crazy.

Similar Sayings: "Off your rocker", "Out of your mind", "Crazy", "Far fetched"
When someone says something that is absolutely ridiculous and does not make sense, you respond with:

"Oh, you're up in the night!"

Or you can refer to someone else:
Mary: "Jane said it was snowing last night... it was 72 Degrees Out"
Molly: "She's got to be up in the night."
by wdyc1199 November 15, 2013
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a phrase originating in Utah from the Pulsipher clan to describe someone who has crazy thoughts or ideas.
Josiah: hey, maybe our religion isn't the only one. Maybe we should learn about other religions....

Moroni: I think you are up in the night
by Kayzee_utah July 9, 2017
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P1: "Jenny told me I can enter her backdoor dude"
P2: "Oh nice dude"
P1: "Nut up at the night of my life!"
by lizardkid September 11, 2018
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Very first album of up and coming boyband one direction. First time the public can TRULY recognize the talent in each of the voices seperately, as all the boys get solos. Absolutely amazing, well worth the buy.

Contains 13 tracks on the regular album;

What makes you beautiful
gotta be you
one thing
more than this
up all night
i wish
tell me a lie
taken
i want
everything about you
same mistakes
save you tonight
stole my heart

and the extra two on the extended edition;
Stand Up
Moments
Random girl; omg up all night is so amazing
Directioner; its amaZAYN, yeah, its such an amazing album!
by Directioner<3 November 22, 2011
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The first song to be released by Blink-182 in over 4 years. Not currently released yet (today is 10/14/09)
My friend: When the f**k is Up All Night gonna be released?
Me: Idk, hopefully soon though
by Blink182-2009 October 15, 2009
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do you see billy over there, don't he look bad as he's been up all night for the last 5 days
by tuffpuff April 8, 2010
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A way to say you had sex with someone. Comes from the song "Sweat" by Chris Brown ft. Flo Rida.
"So, dude, what'd you do with your girl last night?"
"I was up all night autographin' it!"
by danananabatman February 27, 2009
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