ALBANY, N.Y. -- The defending Super Bowl champion New York Giants apparently haven't been sleeping very well.

And it has nothing to do with facing the New York Jets, Tim Tebow or the Wildcat on Saturday.

At least five Giants -- offensive tackles Will Beatty and James Brewer, defensive tackles Marvin Austin and Martin Parker, and cornerback Terrell Thomas -- have had back issues during training camp.

Multiple players believe the small mattresses at the University of Albany, most of which were provided by the Giants, may have played a role in the back injuries. Some players even brought their own mattresses to camp.

"Yes, I really do," defensive tackle Linval Joseph said when asked if the beds really have something to do with players suffering back injuries. "I really do. Beds.

"I mean, everybody has been complaining about their back because the beds in the dorm are fairly hard. My back be hurting, too. I think it is just the bed."

Tight end Martellus Bennett said his back is fine but admitted the beds on campus are a bit tiny.

"We are big humans," Bennett said. "Every bed is small. You can't put a damn dinosaur in a twin-sized bed ... all the beds, unless you got a California king, the beds are going to be small to these guys. If a normal-sized human jumps into a regular-sized bed, it fits perfectly. A large big human jumps into a regular-sized bed, the bed is too small."

The Giants maintain that no players have complained to them about the mattresses.

While most of their injuries are football-related, the Giants have had some back issues pop up. Beatty had a sciatic nerve condition with his back dating to the offseason and was held out of OTAs and most of minicamp.

But after practicing at the start of training camp, his back issue flared up while here in Albany. Beatty returned to practice on Sunday. His backup, Brewer, also has battled some back issues during camp.

"Those beds are not the best," Brewer said Monday. "I'm not going to knock Albany because hey, it could always be worse, but I definitely do miss my own bed."

"Will's complaining, but at least he has a regular-sized bed," Brewer added. "I have like a little kid's cot, like I'm in college all over again."