1st Round Draft Pick D.J. Fluker -- I'm HUGE ... and My College Bed Was TINY!!

D.J. Fluker -- the 11th overall pick in the NFL Draft -- is 6'6" and 340 pounds ... which is why it's pretty damn shocking that he was forced to sleep in a TWIN SIZE BED during his college career!!

We shot the 22-year-old offensive lineman on his way into the draft in NYC last night -- right before he was selected by the S.D. Chargers -- when Fluker told us that giants like him were treated just like everyone else when it came to dorm living at the University of Alabama.

For the record, a standard twin mattress is 75 inches long ... Fluker is 78 inches long.

D.J. won't have any bed problems any more ... he'll become a multi-millionaire when he officially signs his contract -- he can buy any bed he wants.