Heisman Trophy winner Johnny Manziel caught a lot of media heat for exiting the 2013 Manning Passing Academy early due to dehydration.

The Texas A&M quarterback told ESPN's "SportsCenter" on Wednesday that his departure was unrelated to anything that happened the night before he missed a morning meeting.

"I made a mistake and didn't wake up in time when I should have, and that's pretty much the end of that," Manziel said. "It was just simply my phone died, I overslept."

Manziel refused to answer a direct question about drinking alcohol during his time at the camp. "I'm not going into details about what happened at the Manning camp," Manziel said. "We had social events every night." He insists he was "absolutely not" hungover when he missed the meeting that led to his early exit.

Although the 20-year-old has been criticized for partying too heavily, Manziel gave no indication that this incident will change his behavior.

"I'm still a sophomore in college. I'm still going to do things that everybody in college does and I'm going to continue to enjoy my life," Manziel explained. "Hopefully people don't hold me to a higher standard than that."