Aston Villa are testing a new device which checks when players are tucked up in bed and whether or not they have been drinking.
The £625 armband sensor is being piloted as part of the club's aim of staying at the forefront of sports technology, a club spokesman said.
The main purpose of the armband is to show a play-er's fitness level and whether or not he is being trained to the optimal level.
But they can also be used to check if a player is staying out late and partying into the early hours.
They will show when a player is sleeping, each time they eat, and how hard they are training. Several leading Premiership clubs are looking at the device but so far only Villa has bought one.