Dark patterns in UI promote addictive behaviors. We explore how the efects of dark patterns in video streaming applications can be exacerbated by a range of temporal and contextual factors. Previous work has shown that excessive watching is potentially detrimental to physical and mental health. We conduct a diary study with 22 viewers over 228 sessions to gain insight into users' states of mind and to identify users' emotions while interacting with 4 popular streaming platforms. We analyze users during both the selection phase and the completion phase, fnding meaningful correlations between user mood and contextual behaviors that highlight how 776