If you looking for your real love
Well goodnight my dear

from T.I. (Ft. Kanye West & Kid Cudi) – Welcome to the World Lyrics on Rap Genius

Meaning

he says if your looking for your real love, goodnight my dear because he is playing off the two expressions of:
1) “in your dreams” thats the only place you’ll find true love.
or
2) “give it a rest”. Hence the word goodnight.

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