Several psych studies have made the news these last couple years with findings that self-control and decision making are limited resources that suffer badly if we 'use them up.' Some newly published research suggests that one way to fill the tank is by returning to "familiar fictional worlds," re-reading or re-watching favorite books, films and television, or new episodes in a favorite series. Study participants were found to perform better on tasks requiring effortful self control if they spent time with familiar works the night before, rather than watch or read something new.
The laypeoples version:
http://io9.com/5937626/watching-reru...tore-willpower
The research paper:
http://spp.sagepub.com/content/early...54889.abstract