What is a sleeper?

[*ochocincos*]

I usually consider someone a sleeper who is a Day 3 pick that ends up being solid-or-better starter within a year or so.
Someone I would possibly consider a sleeper for this draft (although I keep hearing their name brought up more and more) - Cam Jurgens, C Nebraska or maybe Velus Jones, WR Tennessee (slot and returner).

Jelani Woods and Alec Pierce probably were more sleepers before the Combine, but the Combine really put a spotlight on them and now people are pushing them up their draft boards.