In their never-ending quest to find a winning edge, NFL teams are turning their players on to the most accessible and natural performance-enhancer: a good night’s sleep, reports The MMQB.

The Dolphins and Patriots have dark rooms at their practice facilities so players can take naps. Eagles players fill out a morning questionnaire on their tablets, self-reporting how long and how well they slept the previous night. When linebacker Demario Davis arrives at Jets headquarters at 6 a.m. to study film, he does so in the glow of a team-issued Litebook, a space-age device that helps him become more alert by emitting a beam of white light that has the same intensity as full daylight.