KNOXVILLE, Tenn. (AP) Tennessee is studying its football players' sleep habits to make sure they don't get caught napping when a game's on the line.

About an hour before their scheduled bedtime, players get reminders via apps on their phones. They wear orange glasses that block out the blue light of smartphones or computer screens, making it easier for them to fall asleep. Selected players have sensors above their mattresses and under their bedsheets to monitor sleep patterns.

The idea is that if they sleep better each night, they'll work better the following day.

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Jones' staff is working in conjunction with Rise Science, a Chicago-based company founded by three former Northwestern students. They studied how increased sleep produced better athletic performance and started assisting various Northwestern teams.