Extrinsic motivation is a tricky one; rationalization is easy: "I will make up for the 100$ if I'm well rested, so I better snooze some more!". What about a gu

Extrinsic motivation is a tricky one; rationalization is easy: "I will make up for the 100$ if I'm well rested, so I better snooze some more!". What about a guillotine above your head? That should be enough.