(TMZ) - Ray J crashed and burned the morning after the Billboard Music Awards... and landed in the hospital, TMZ reports.

Ray J was extremely upset after his confrontation with Whitney Houston's family - notably Pat Houston - during the awards ceremony.  On Monday morning, someone went into Ray J's hotel room and realized the singer was "out of it" and couldn't get out of bed.

Ray J was extremely disoriented and was immediately taken to the hospital by ambulance.

As for what happened... it's looking like a combo of exhaustion and stress.  Ray J had just returned from a quick, 32-hour round trip to China and when he landed he immediately drove 4 hours to Las Vegas for the awards show.

Ray J is still in the hospital.  No word on when he'll be released. 

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