Confused between last night and yesterday night

How correct using the word "last night" is? Which is the correct word "last night" or "yesterday night"? :-?

Here is an interesting discussion:

http://english.stackexchange.com/questions/15718/why-do-we-say-last-night-and-not-yesterday-night

Quote:

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Originally Posted by Neha Patel

How correct using the word "last night" is? Which is the correct word "last night" or "yesterday night"? :-?

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Use last night.