My sleeper is James Wilson, OG Florida.
He was the rivals #8 High school prep coming out of HS. Played high school football in Florida with Tim Tebow. The guy can pull either direction, Has tremendous size at 6'4" 320lbs. and can pancake opposing D lineman. Watched him play his entire career at Florida. If he did not have nagging knee problems he would be a 2-3rd round pick. I know he has been in contact with a couple of NFL teams. If not selected in the draft, well worth bringing in for a look.
Besides, He is a Bronco's fan as well.