While mindfulness has been studied in various settings and proven to be beneficial in stress reduction, attention enhancement, etc., few studies have been conducted in the context of mindfulness in technology-use settings, and so far, data collection relies only on subjective self-reporting. This research aims to generate guidelines that facilitate more mindful, healthier use of predictions for trait mindfulness. We identify mindfulness as a key path toward emotional well-being and propose to capture mindfulness using objective, neurophysiological measures including Galvanic Skin Response (GSR), eye-tracking, and facial expression analysis as well as subjective self-reported measures. Our study aims to contribute to the literature by developing and validating an objective way to measure trait mindfulness regarding emotions.