"Ray J crashed and burned the morning after the Billboard Music Awards ... and landed in the hospital ... 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 dehydration.  Ray J had just returned from a quick, 32-hour round trip to China for business 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."