Probably difficult to actually study this as there are cultural aspects. Most people haven't a particularly well-cultivated sense of discipline because they've

Probably difficult to actually study this as there are cultural aspects. Most people haven't a particularly well-cultivated sense of discipline because they've grown up in a culture where this is seen as negative. You're seen as boring or even wasting your life if you don't indulge your impulses frequently enough. Missing out on having fun is seen as a very bad thing.