Five minute read from CBS SPORTS about the disappearing home field advantage and how players may be impacted, for better or worse, from fans not being in attendance. Also touches on how refs may be affected by no fans in the stadium.
https://www.cbssports.com/nfl/news/no-fans-allowed-how-home-field-advantage-could-be-affected-in-nfl-season-without-full-stadiums/?ftag=SPM-16-10abi8e
"You know, I'm going to say yes and here's why," Parry says. "When you get booed -- and I'm talking booed -- I'm not talking about when there's a holding call and 15,000 people don't like it and it subsides 20-30 seconds later and the game goes on; that is water off the back -- but I have been booed for a length of time, and it does affect your psyche. And you wish at times you could crawl under a rock and you wish you could have it back."