The difference between Last night and Yesterday night
When used as nouns, last night means the evening or night immediately before the present, whereas yesterday night means last night.
Last night is also adverb with the meaning: during the previous day's nighttime. during the night before today.
check bellow for the other definitions of Last night and Yesterday night
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Last night as a noun (often, used adverbially):
The evening or night immediately before the present.
Examples:
"He said he didn't get any sleep last night and I know he hadn't gotten much the previous night."
"Last night was wonderful. Can I see you again?"
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Last night as an adverb:
During the previous day's nighttime. During the night before today.
Examples:
"“We partied last night.”"
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Yesterday night as a noun:
Last night.