I don't see why you don't see like I do
But it just dawned on me you lost a son,

from Dr. Dre (Ft. Eminem & Skylar Grey) – I Need a Doctor Lyrics on Rap Genius

Meaning

Dr. Dre’s second son, Andre Young, Jr., died at age 20 in August 2008 from a heroin overdose. Em realizes that this is why Dre isn’t as optimistic as he is

Also some son/sun wordplay to go with “dawned on me” (reminiscent of Shakespeare’s Richard III: “Now is the Winter of our discontent, made glorious Summer by this sun/son of York”)

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