The links between Boredom & dopamine

Have you ever found yourself relaxing, with some form of entertainment be it TV, a game or a book and you start to realise that you're extremely bored? The activity you're doing to relax and escape your dreary everyday life is completely and totally boring all of a sudden. That has happened to me on numerous occasions, I start to think to myself, why am I wasting my life doing this? A wave flows over me and I feel, not quite existential dread but rather existential boredom.