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Brainwave entrainment is a method for inducing brainwaves to synchronize to the oscillations of an external stimulus. Computer and mobile displays provide a significant opportunity for non-obtrusive brainwave entrainment, as the therapy can be applied while the user is using the device normally, thereby obviating the need for active engagement from the user. To date, there is no prior HCI literature attempting to induce brainwave entrainment through external stimuli. Here, we introduce the concept in the context of HCI, describe the system development, detail several possible instantiations of entrainment interfaces, and describe user feedback from a preliminary user study. This work can ultimately result in a translational intervention which can be used in home and work settings.