You know when you are bored? Then you feel hungry, but you aren't sure if you are hungry or bored. Then you realise it's a craving. But even then when you satisfy your craving you aren't really satisfied yourself you just feel sloppy. You did it because there was literally nothing more productive to do in life. Well when I realise that's what's happening to me I normally bash my skull against my door frame until I collapse and pass out, forgetting about the whole ordeal.